UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
 

FORM 10-Q

x    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D)15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended June 30, 2017March 31, 2018
o    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D)15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from ________ to ________

Commission file number 000-50368

atsglogocolora23.jpg
(Exact name of registrant as specified in its charter)

Delaware 26-1631624
(State of Incorporation) (I.R.S. Employer Identification No.)
   
145 Hunter Drive, Wilmington, OH 45177
(Address of Principal Executive Offices) (Zip Code)

937-382-5591
(Registrant’s telephone number, including area code)
 


Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. YES x NO o
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulations S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). YES x NO o
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer ox
  
Accelerated filer xo
Non-accelerated filer o (Do not check if a smaller reporting company)
  
Smaller reporting company o
Emerging growth company o
  
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. o
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). YES o NO  x
As of August 8 2017, 59,123,112May 10, 2018, 59,080,512 shares of the registrant’s common stock, par value $0.01, were outstanding.

     







AIR TRANSPORT SERVICES GROUP, INC. AND SUBSIDIARIES
FORM 10-Q
TABLE OF CONTENTS
    
    Page
PART I. FINANCIAL INFORMATION
Item 1.  
   
   
   
   
   
Item 2. 
Item 3. 
Item 4. 
   
PART II. OTHER INFORMATION
Item 1.  
Item 1A.  
Item 2.  
Item 5.
Item 6.  





FILINGS WITH THE SECURITIES AND EXCHANGE COMMISSION
The financial information, including the financial statements, included in the Quarterly Report on Form 10-Q should be read in conjunction with the Company's audited consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2016,2017, filed with the Securities and Exchange Commission on March 8, 2017.1, 2018.
The Securities and Exchange Commission maintains an Internet site that contains reports, proxy and information statements and other information regarding Air Transport Services Group, Inc. at www.sec.gov. Additionally, our filings with the Securities and Exchange Commission, including annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to these reports, are available free of charge from our website at www.atsginc.com as soon as reasonably practicable after filing with the SEC.

FORWARD LOOKING STATEMENTS
Statements contained in this Quarterly report on Form 10-Q that are not historical facts are considered forward-looking statements (as that term is defined in the Private Securities Litigation Reform Act of 1995). Words such as “projects,“future,” “anticipates,” “believes,” “anticipates,“estimates,” “expects,” “intends,” “plans,” “predicts,” “will,” “estimates,“would,“plans,“could,“expects,“can,“intends”“may,” and similar wordsterms and expressions are intended to identify forward-looking statements. These forward-looking statements are based on expectations, estimates and projections as of the date of this filing, and involve risks and uncertainties that are inherently difficult to predict. Actual results may differ materially from those expressed in the forward-looking statements for any number of reasons, including those described in this report and in our 20162017 Annual Report filed on Form 10-K with the Securities and Exchange Commission.





PART I. FINANCIAL INFORMATION
Item 1. Financial Statements
AIR TRANSPORT SERVICES GROUP, INC. AND SUBSIDIARIES
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(In thousands, except per share data)
Three Months Ended
Three Months Ended June 30, Six Months Ended June 30,March 31
2017 2016 2017 20162018 2017
REVENUES$253,211
 $176,549
 $491,128
 $353,934
$203,040
 $237,917
OPERATING EXPENSES          
Salaries, wages and benefits66,010
 53,647
 138,673
 106,066
70,783
 72,486
Depreciation and amortization37,781
 33,132
 74,223
 65,666
40,004
 36,442
Maintenance, materials and repairs37,588
 30,345
 67,870
 60,772
36,866
 30,282
Fuel32,258
 17,168
 67,099
 33,799
5,788
 34,841
Contracted ground and aviation services32,151
 8,931
 52,838
 19,799
2,384
 20,687
Travel6,820
 4,678
 14,186
 9,486
6,632
 7,366
Landing and ramp4,357
 2,652
 9,656
 6,303
1,148
 5,299
Rent3,753
 2,579
 7,039
 5,206
3,230
 3,286
Insurance955
 1,087
 2,217
 2,236
1,357
 1,262
Other operating expenses8,590
 6,529
 16,626
 13,449
7,205
 8,036
230,263
 160,748
 450,427
 322,782
175,397
 219,987
OPERATING INCOME22,948
 15,801
 40,701
 31,152
27,643
 17,930
OTHER INCOME (EXPENSE)          
Interest income16
 37
 48
 61
23
 32
Non-service component of retiree benefit costs2,045
 (177)
Net gain (loss) on financial instruments(67,649) 5,558
 (65,780) 5,030
(885) 1,869
Loss from non-consolidated affiliate(2,536) 
Interest expense(3,759) (2,633) (7,307) (5,332)(5,362) (3,548)
(71,392) 2,962
 (73,039) (241)(6,715) (1,824)
          
EARNINGS (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES(48,444) 18,763
 (32,338) 30,911
EARNINGS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES20,928
 16,106
INCOME TAX EXPENSE(5,474) (7,235) (11,784) (11,212)(5,246) (6,310)
EARNINGS (LOSS) FROM CONTINUING OPERATIONS(53,918) 11,528
 (44,122) 19,699
EARNINGS FROM CONTINUING OPERATIONS15,682
 9,796
EARNINGS FROM DISCONTINUED OPERATIONS, NET OF TAXES192
 47
 384
 94
196
 192
NET EARNINGS (LOSS)$(53,726) $11,575
 $(43,738) $19,793
NET EARNINGS$15,878
 $9,988
          
BASIC EARNINGS (LOSS) PER SHARE       
BASIC EARNINGS PER SHARE   
Continuing operations$(0.91) $0.18
 $(0.75) $0.31
$0.27
 $0.17
Discontinued operations
 
 0.01
 

 
TOTAL BASIC EARNINGS (LOSS) PER SHARE$(0.91) $0.18
 $(0.74) $0.31
TOTAL BASIC EARNINGS PER SHARE$0.27
 $0.17
          
DILUTED EARNINGS (LOSS) PER SHARE       
DILUTED EARNINGS PER SHARE   
Continuing operations$(0.91) $0.12
 $(0.75) $0.25
$0.26
 $0.13
Discontinued operations
 
 0.01
 
0.01
 
TOTAL DILUTED EARNINGS (LOSS) PER SHARE$(0.91) $0.12
 $(0.74) $0.25
TOTAL DILUTED EARNINGS PER SHARE$0.27
 $0.13
          
WEIGHTED AVERAGE SHARES          
Basic59,035
 63,267
 59,084
 63,452
58,840
 59,133
Diluted59,035
 66,763
 59,084
 65,910
59,558
 64,949

See notes to condensed consolidated financial statements.

AIR TRANSPORT SERVICES GROUP, INC. AND SUBSIDIARIES
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(In thousands)
 Three Months Ended Six Months Ended
 June 30, June 30,
 2017 2016 2017 2016
NET EARNINGS (LOSS)$(53,726) $11,575
 $(43,738) $19,793
OTHER COMPREHENSIVE INCOME:       
Defined benefit pension1,235
 2,146
 2,469
 4,292
Defined benefit post-retirement37
 9
 74
 18
Foreign currency translation99
 53
 136
 310
        
TOTAL COMPREHENSIVE INCOME (LOSS), NET OF TAXES$(52,355) $13,783
 $(41,059) $24,413
 Three Months Ended
 March 31
 2018 2017
NET EARNINGS$15,878
 $9,988
OTHER COMPREHENSIVE INCOME (LOSS):   
Defined Benefit Pension687
 1,234
Defined Benefit Post-Retirement42
 37
Foreign Currency Translation(16) 37
    
TOTAL COMPREHENSIVE INCOME, net of tax$16,591
 $11,296

See notes to condensed consolidated financial statements.


AIR TRANSPORT SERVICES GROUP, INC. AND SUBSIDIARIES
UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS
(In thousands, except share data)
June 30, December 31,March 31, December 31,
2017 20162018 2017
ASSETS      
CURRENT ASSETS:      
Cash and cash equivalents$63,020
 $16,358
$47,472
 $32,699
Accounts receivable, net of allowance of $1,380 in 2017 and $1,264 in 201675,303
 77,247
Accounts receivable, net of allowance of $2,495 in 2018 and $2,445 in 2017100,186
 109,114
Inventory16,412
 19,925
22,256
 22,169
Prepaid supplies and other23,918
 19,123
13,426
 20,521
TOTAL CURRENT ASSETS178,653
 132,653
183,340
 184,503
Property and equipment, net1,074,239
 1,000,992
1,176,520
 1,159,962
Lease incentive76,458
 80,684
Goodwill and acquired intangibles44,287
 44,577
Convertible note hedges56,046
 53,683
Other assets86,526
 80,099
30,852
 25,435
Goodwill and acquired intangibles45,455
 45,586
TOTAL ASSETS$1,384,873
 $1,259,330
$1,567,503
 $1,548,844
LIABILITIES AND STOCKHOLDERS’ EQUITY      
CURRENT LIABILITIES:      
Accounts payable$77,945
 $60,704
$96,041
 $99,728
Accrued salaries, wages and benefits30,963
 37,044
29,436
 40,127
Accrued expenses9,902
 10,324
10,259
 10,455
Current portion of debt obligations20,133
 29,306
14,846
 18,512
Unearned revenue22,480
 18,407
12,765
 15,850
TOTAL CURRENT LIABILITIES161,423
 155,785
163,347
 184,672
Long term debt508,152
 429,415
515,595
 497,246
Convertible note obligations56,881
 54,359
Stock warrant obligations214,205
 211,136
Post-retirement obligations71,866
 77,713
56,771
 61,355
Other liabilities50,143
 52,542
44,276
 45,353
Stock warrants177,850
 89,441
Deferred income taxes135,506
 122,532
107,930
 99,444
TOTAL LIABILITIES1,104,940
 927,428
1,159,005
 1,153,565
Commitments and contingencies (Note G)
 
Commitments and contingencies (Note H)
 
STOCKHOLDERS’ EQUITY:      
Preferred stock, 20,000,000 shares authorized, including 75,000 Series A Junior Participating Preferred Stock
 

 
Common stock, par value $0.01 per share; 85,000,000 shares authorized; 59,123,112 and 59,461,291 shares issued and outstanding in 2017 and 2016, respectively591
 595
Common stock, par value $0.01 per share; 85,000,000 shares authorized; 59,080,512 and 59,057,195 shares issued and outstanding in 2018 and 2017, respectively591
 591
Additional paid-in capital432,510
 443,416
467,570
 471,456
Accumulated deficit(75,981) (32,243)
Retained earnings (accumulated deficit)2,644
 (13,748)
Accumulated other comprehensive loss(77,187) (79,866)(62,307) (63,020)
TOTAL STOCKHOLDERS’ EQUITY279,933
 331,902
408,498
 395,279
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY$1,384,873
 $1,259,330
$1,567,503
 $1,548,844
      
See notes to condensed consolidated financial statements.

AIR TRANSPORT SERVICES GROUP, INC. AND SUBSIDIARIES
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands)
Six Months EndedThree Months Ended
June 30,March 31
2017 20162018 2017
OPERATING ACTIVITIES:      
Net earnings (loss) from continuing operations$(44,122) $19,699
Net earnings from continuing operations$15,682
 $9,796
Net earnings from discontinued operations384
 94
196
 192
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization80,097
 66,600
46,320
 39,033
Pension and post-retirement3,990
 6,764
942
 1,995
Deferred income taxes11,454
 10,969
5,053
 6,149
Amortization of stock-based compensation1,710
 1,575
1,014
 784
Net (gain) loss on financial instruments65,780
 (5,030)885
 (1,869)
Changes in assets and liabilities:      
Accounts receivable1,905
 6,376
10,567
 (6,487)
Inventory and prepaid supplies(1,822) (1,560)4,871
 (4,413)
Accounts payable14,244
 (2,552)(608) 6,932
Unearned revenue1,807
 (3,141)(3,752) 4,765
Accrued expenses, salaries, wages, benefits and other liabilities(6,793) (638)(10,079) (9,911)
Pension and post-retirement assets(5,847) (3,881)(4,584) (3,039)
Other1,991
 2,018
2,335
 283
NET CASH PROVIDED BY OPERATING ACTIVITIES124,778
 97,293
68,842
 44,210
INVESTING ACTIVITIES:      
Capital expenditures(144,325) (125,076)(79,092) (83,786)
Proceeds from property and equipment16,763
 
Acquisitions and investments in businesses(646) 
(2,450) (640)
Redemption of long term deposits9,975
 

 4,725
NET CASH (USED IN) INVESTING ACTIVITIES(134,996) (125,076)(64,779) (79,701)
FINANCING ACTIVITIES:      
Principal payments on long term obligations(20,500) (12,623)(17,390) (10,337)
Proceeds from borrowings90,000
 60,000
30,000
 60,000
Payments for financing costs(17) 
Purchase of common stock(11,184) (10,818)(564) (1,463)
Withholding taxes paid for conversion of employee stock awards(1,436) (1,231)(1,319) (1,436)
NET CASH PROVIDED BY FINANCING ACTIVITIES56,880
 35,328
10,710
 46,764
      
NET INCREASE IN CASH AND CASH EQUIVALENTS46,662
 7,545
14,773
 11,273
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR16,358
 17,697
32,699
 16,358
CASH AND CASH EQUIVALENTS AT END OF PERIOD$63,020
 $25,242
$47,472
 $27,631
      
SUPPLEMENTAL CASH FLOW INFORMATION:      
Interest paid, net of amount capitalized$7,101
 $5,104
$2,413
 $3,406
Federal alternative minimum and state income taxes paid$1,220
 $464
$526
 $113
SUPPLEMENTAL NON-CASH INFORMATION:      
Accrued capital expenditures$12,615
 $5,923
$24,629
 $18,251
See notes to condensed consolidated financial statements.

AIR TRANSPORT SERVICES GROUP, INC. AND SUBSIDIARIES
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

NOTE A—SUMMARY OF FINANCIAL STATEMENT PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES

Nature of Operations
Air Transport Services Group, Inc. is a holding company whose principal subsidiaries include an aircraft leasing companyprimarily operate within the airfreight and two U.S. certificated airlines.logistics industry. The Company leases aircraft and provides airline operations, ground services, aircraft leases, aircraftmodification and maintenance services and other support services primarily to the cargo transportation and package delivery industries. Through theservices. The Company's subsidiaries it offersoffer a range of complementary services to delivery companies, freight forwarders, airlines and government customers.
The Company's leasing subsidiary, Cargo Aircraft Management, Inc. (“CAM”), leases aircraft to each of the Company's airlines as well as to non-affiliated airlines and other lessees. The airlines, ABX Air, Inc. (“ABX”) and Air Transport International, Inc. (“ATI”), each have the authority, through their separate U.S. Department of Transportation ("DOT") and Federal Aviation Administration ("FAA") certificates, to transport cargo worldwide. ATI provides passenger transportation, primarily to the U.S. Military, using "combi" aircraft, which are certified to carry passengers as well as cargo on the main deck.
The Company provides air transportation services to a concentrated base of customers. The Company providesCompany's airlines provide a combination of aircraft, crews, maintenance and insurance services for a customer's transportation network through "CMI" and "ACMI" agreements and through charter contracts in which aviation fuel is also included. ATI provides passenger transportation, primarily to the U.S. Military, using "combi" aircraft, which are certified to carry passengers as well as cargo on the main deck.
In addition to its airline operations and aircraft leasing services, the Company sells aircraft parts, provides aircraft maintenance and modification services, equipment maintenance services, and operates mail and package sorting facilities.
Basis of Presentation
The accompanying unaudited condensed interim consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States of America and such principles are applied on a basis consistent with the financial statements reflected in our Annual Report on Form 10-K for the fiscal year ended December 31, 20162017 filed with the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to the rules and regulations promulgated by the SEC related to interim financial statements. In the opinion of management, the accompanying financial statements contain all adjustments, including normal recurring adjustments, necessary for the fair presentation of the Company’s results of operations and financial position for the periods presented. Due to seasonal fluctuations, among other factors common to the airlineair cargo industry, the results of operations for the periods presented are not necessarily indicative of the results of operations to be expected for the entire year or any interim period. The preparation of consolidated financial statements requires management to make estimates and assumptions that affect amounts reported in the consolidated financial statements. The accounting estimates reflect the best judgment of management, but actual results could differ materially from those estimates.
The accompanying condensed consolidated financial statements include the accounts of Air Transport Services Group, Inc. and its wholly-owned subsidiaries. Investments in an affiliateaffiliates in which the Company has significant influence but does not exercise control are accounted for using the equity method of accounting. Using the equity method, the Company’s share of the nonconsolidated affiliate'saffiliates' income or loss is recognized in the consolidated statement of earnings and cumulative post-acquisition changes in the investment are adjusted against the carrying amount of the investment. Inter-company balances and transactions are eliminated.
New Accounting PronouncementsStandards Updates
In May 2014,Effective January 1, 2018 the Company adopted the Financial Accounting Standards BoardBoard's ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”("Topic 606”). In April 2016, the FASB issued ASU No. 2016-10, "Revenue from Contracts with Customers, Identifying Performance Obligations and

Licensing" clarifying the accounting under ASU 2014-09 for licenses of intellectual property and for identifying distinct performance obligations in a contract.
ASU 2014-09 which superseded previous revenue recognition guidance. Topic 606 is a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. ASU 2014-09 also requires additional disclosure aboutThe Company's lease revenues within the nature, amount, timing and uncertaintyscope of revenue and cash flows arisingASC 840, Leases, are specifically excluded from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017 with earlier adoption permitted for reporting periods beginning after December 15, 2016. ASU 2014-09 may be appliedTopic 606.

The Company adopted the standard using either a full retrospective approach, under which all years included in the financial statements will be presented under the revised guidance, or a modified retrospective approach, under which financial statements will beare prepared under the revised guidance for the year of adoption, but not for prior years. Under the latterthis method, entities would recognize a cumulative catch-up adjustment to the opening balance of retained earnings at the effective date for open contract performance at that time. The Company's adoption efforts have included the identification of revenue within the scope of the standard, the evaluation of customer contracts that still require performance byin conjunction with new guidance and an assessment of the entity,qualitative and disclose all line items in the yearquantitative impacts of adoption as if they were prepared under the old revenue guidance.
The Company is currently evaluating the methods of adoption allowed by the new standard and the effect the standard is expected to have on the Company's consolidatedits financial position, results of operations or cash flows and related disclosures.statements. The evaluation includesincluded the application of each of the five steps identified in the ASU 2014-09Topic 606 revenue recognition model, whichmodel.
The Company determined that under Topic 606, it is an agent for aviation fuel and certain other costs reimbursed by customers under its ACMI and CMI contracts and for certain cargo handling services that it arranges for a customer. Under the new revenue standard, such reimbursed amounts are as follows: 1) identifyreported net of the contract withcorresponding expenses beginning in 2018. This application of Topic 606 did not have a material impact on the customer; 2) identify the performance obligationsCompany's reported earnings in the contract; 3) determine the transaction price; 4) allocate the transaction price to the performance obligations; and 5) recognize revenue when (or as) performance obligations are satisfied. The Company's lease contracts within the scope of ASC 840, Leases, are specifically excluded from ASU 2014-09. Asany period. Additionally under Topic 606, the Company completes its evaluationis required to record revenue over time, instead of at the time of completion, for certain customer contracts for airframe and modification services that do not have an alternative use and for which the Company has an enforceable right to payment during the service cycle. The Company adopted the provisions of this new standard new information may ariseusing the modified retrospective method which requires the Company to record a one time adjustment to retained deficit for the cumulative effect that could change the Company's current understandingstandard has on open contracts at the time of adoption. Upon adoption of the impactnew standard the Company accelerated $3.6 million of revenue resulting in an immaterial adjustment to revenueits January 1, 2018 retained deficit for open airframe and expense recognized. Management is monitoring recent industry activities and other guidance provided by regulators, standards setters, andmodification services contracts.
In January 2017, the accounting profession that may affect the Company’s assessment and implementation plans.
In July 2015, FASB issued ASU "Inventory"Intangibles-Goodwill and Other (Topic 330)350): Simplifying the MeasurementTest for Goodwill Impairment" (“ASU 2017-04”). This new standard eliminates Step 2 from the goodwill impairment test and requires an entity to perform its goodwill impairment test by comparing the fair value of Inventory" ("a reporting unit with its carrying amount. An entity recognizes an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. ASU 2015-11"). ASU 2015-11 more closely aligns2017-04 is effective for any annual or interim goodwill impairment tests in the measurement of inventory in GAAP with the measurement of inventory in International Financial Reporting Standards ("IFRS"). The amendment in ASU 2015-11 is for fiscal years beginning after December 15, 2016,2019 and interim periods within fiscal years beginning after December 15, 2017. The amendment shouldmust be applied prospectively with earlier applicationprospectively. Early adoption is permitted as of the beginning of anfor interim or annual reporting period.goodwill impairment tests performed on testing dates after January 1, 2017. The Company doesadopted this new accounting guidance in January of 2018. The adoption did not expect thehave an impact of adopting ASU 2015-11 to be material toon the Company's financial statements and related disclosures.position, results of operations, or cash flows.
In March 2017, the FASB issued ASU "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost" (ASUCost "(ASU 2017-07"). ASU 2017-07 requires an employer to report the service cost component of retiree benefits in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost wouldare required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. The standard is effective for annual periods beginning after December 15, 2017 and should be applied retrospectively.operations. The Company anticipatesadopted ASU 2017-07 on January 1, 2018, retrospectively to all periods presented. As a result, retiree benefit plan interest expense, investment returns, settlements and other non-service cost components of retiree benefit expenses are excluded from the standard will impact the Operating IncomeCompany's operating income subtotal as reported in the Company's Consolidated Statement of Operations, by excluding interest expense, investment returns and other non service cost components ofbut remain included in earnings before income taxes. Information about retiree benefit expenses. Information aboutplans' interest expense, investment returns and other components of retiree benefit expenses can be found in Note H.I.
In February 2016, the FASB issued ASU "Leases (Topic 842)" ("ASU 2016-02"), which will require the recognition of right to-use-assets and lease liabilities for leases previously classified as operating leases by lessees. The standard will take effect for annual reporting periods beginning after December 15, 2018, including interim reporting periods. Early application will be permitted for all entities. In addition, the FASB has decided to require a lessee to apply a modified retrospective transition approach for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements (the date of initial application). The modified retrospective approach would not require any transition accounting for leases that expired before the date of initial application. The FASB decided to not permit a full retrospective transition approach. The Company is currently evaluating the impact of the standard on its financial statements and disclosures.

In August 2016,February 2018, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classification“Reclassification of Certain Cash Receipts and Cash Payments"Tax Effects From Accumulated Other Comprehensive Income" ("ASU 2016-15"2018-02"). ASU 2016-15 clarifies how cash receipts2018-02 amends ASC 220, Income Statement — Reporting Comprehensive Income, to allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from U.S. federal tax legislation known as the Tax Cuts and cash payments inJobs Act. In addition, under the ASU 2018-02, a Company will be required to provide certain transactions are presented and classified in the statement of cash flows. Thedisclosures regarding stranded tax effects. ASU 2018-02 is effective date of this update is for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted. The update requires retrospective application to all periods presented but may be applied prospectively if retrospective application is impracticable. The Company is currently evaluating the impact of the adoption of the standard on its financial statements and disclosures.
In November 2016, the FASB issued ASU "Statement of Cash Flows (Topic 230): Restricted Cash" ("ASU 2016-18"). ASU 2016-18 requires that the statement of cash flows explain the changes in the combined total of restricted and unrestricted cash balance. Amounts generally described as restricted cash or restricted cash equivalents will be combined with unrestricted cash and cash equivalents when reconciling the beginning and end of period balances on the statement of cash flows. Further, the ASU requires a reconciliation of balances from the statement of cash flows to the balance sheet in situations in which the balance sheet includes more than one line item of cash, cash equivalents, and restricted cash. Companies will also be disclosing the nature of the restrictions. ASU 2016-18 is effective for financial statements issued for fiscal years beginning after December 15, 2017. The Company is currently evaluating the impact of the standard on its financial statements and disclosures.
In January 2017, the FASB issued ASU "Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment" ("ASU 2017-04"). ASU 2017-04 will simplify the subsequent measurement of goodwill by eliminating the second step from the goodwill impairment test. ASU 2017-04 would require applying a one-step quantitative test and recording the amount of goodwill impairment as the excess of the reporting unit's carrying value over its fair value, not to exceed the total amount of goodwill allocated to the reporting unit. ASU 2017-04 does not amend the optional qualitative assessment of goodwill impairment. The amendments in ASU 2017-04 are effective for annual or any interim goodwill impairment tests for fiscal years beginning after December 15, 2019.years. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017.permitted. The Company is currently evaluating the impact of the standard on its financial statements and disclosures.

NOTE B—SIGNIFICANT CUSTOMERS
DHL
The Company has had long term contracts with DHL Network Operations (USA), Inc. and its affiliates ("DHL") since August 2003. Revenues from aircraft leases and related services performed for DHL were approximately 25%28% and 26% of the Company's consolidated revenues from continuing operations for the three and six month periods ending June 30,March 31, 2018 and 2017, respectively compared to 37% and 36%respectively. Revenues excluding directly reimbursed expenses from continuing operations performed for DHL comprised approximately 30% of the Company's consolidated revenues from continuing operations for the corresponding periods of 2016.three month period ending March 31, 2017. The Company’s balance sheets include accounts receivable with DHL of $6.7$10.8 million and $7.3$15.7 million as of June 30, 2017March 31, 2018 and December 31, 2016,2017, respectively.
The Company leases 16 Boeing 767 aircraft to DHL under both long-term and short-term lease agreements. Under a separate crew, maintenance and insurance (“CMI”) agreement, the Company operates Boeing 767 aircraft that DHL leases from the Company. Pricing for services provided through the CMI agreement is based on pre-defined fees, scaled for the number of aircraft operated and the number of flight crews provided to DHL for its U.S. network. The Company provides DHL with scheduled maintenance services for aircraft that DHL leases. The Company also provides Boeing 767 and Boeing 757 air cargo transportation services for DHL through additional ACMI agreements in which the Company provides the aircraft, crews, maintenance and insurance under a single contract. Revenues generated from the ACMI agreements are typically based on hours flown. The Company also provides ground equipment, such as power units, air starts and related maintenance services to DHL under separate agreements.
Amazon
The Company has been providing freighter aircraft and services for cargo handling and logistical support for Amazon.com Services, Inc. ("ASI"), successor to Amazon Fulfillment Services, Inc. ("AFS"), a subsidiary of Amazon.com, Inc. ("Amazon") since September 2015. On March 8, 2016, the Company entered into an Air Transportation Services Agreement (the “ATSA”) with AFSASI, pursuant to which CAM will leaseleases 20 Boeing 767 freighter aircraft to AFS,ASI, including 12 Boeing 767-200 freighter aircraft for a term of five years and eight Boeing 767-300 freighter aircraft for a term of seven years. The ATSA which has a term

of five years, also provides for the operation of those aircraft by the Company’s airline subsidiaries, and the performancemanagement of hub and gatewayground services by the Company's subsidiary LGSTX Services Inc. ("LGSTX"). The ATSA became effective on April 1, 2016 and has a term of five years. CAM owns all 20 of the Boeing 767 aircraft that are or will be leased and operated under the ATSA. The ATSA became effective on April 1, 2016. As of June 30, 2017, the Company has leased 18 aircraft to AFS and is obligated to lease two more Boeing 767-300 aircraft to AFS during 2017 to meet its 20 aircraft commitment.
Revenues from aircraft leases and related servicescontinuing operations performed for AFSAmazon comprised approximately 42%28% and 41% of the Company's consolidated revenues from continuing operations for the three and six month periods ending June 30,March 31, 2018 and 2017, respectively, compared to 22% and 20%respectively. Revenues excluding directly reimbursed expenses from continuing operations performed for Amazon comprised approximately 27% of the Company's consolidated revenues from continuing operations for the corresponding periods of 2016.three month period ending March 31, 2017. The Company’s balance sheets include accounts receivable with AFSAmazon of $23.9$31.3 million and $24.6$44.2 million as of June 30, 2017March 31, 2018 and December 31, 2016,2017, respectively.
In conjunction with the execution of the ATSA, the Company and Amazon entered into an Investment Agreement and a Stockholders Agreement on March 8, 2016. The Investment Agreement calls for the Company to issue warrants in three tranches which will grant Amazon the right to acquire up to 19.9% of the Company’s outstanding common shares as described below. The first tranche of warrants, issued upon the execution of the Investment Agreement grantsand all of which are now fully vested, granted Amazon the right to purchase approximately 12.81 million ATSG common shares, with the right to purchasefirst 7.69 million common shares vesting upon issuance on March 8, 2016, and the right to purchase the remaining 5.12 million common shares vesting as the Company deliversdelivered additional aircraft leased under the ATSA, or as the Company achieves specified revenue targets in connection with the ATSA. The second

tranche of warrants, which were issued and vested on March 8, 2018, grants Amazon athe right to purchase approximately 1.59 million ATSG common shares, and will be issued and vest on March 8, 2018.shares. The third tranche of warrants will be issued and vest on September 8, 2020. The third tranche of warrants2020, and will grant Amazon the right to purchase such additional number of ATSG common shares as is necessary to bring Amazon’s ownership to 19.9% of the Company’s pre-transaction outstanding common shares measured on a GAAP-diluted basis, adjusted for share issuances and repurchases by the Company following the date of the Investment Agreement and after giving effect to the warrants granted. The exercise price of the warrants will beis $9.73 per share, which represents the closing price of ATSG’s common shares on February 9, 2016. Each of the three tranches of warrants will beare exercisable in accordance with its terms through March 8, 2021. The Company anticipates making available the common shares required for the underlying warrants through a combination of share repurchases and the issuance of additional shares.
The Company’s accounting for the warrants has been determined in accordance with the financial reporting guidance for equity-based payments to non-employees and for financial instruments. During bothThe warrants issued to Amazon as of March 8, 2016, were recorded to stockholders equity, having a fair value of $4.89 per share. At that time, the fair value of the 7.69 million vested warrants issued to Amazon was recorded as a lease incentive asset and is being amortized against revenues over the duration of the aircraft leases. On May 12, 2016, the Company’s stockholders approved an amendment to the Certificate of Incorporation of the Company at the annual meeting of stockholders to increase the number of authorized common shares and to approve the warrants in full as required under the rules of the Nasdaq Global Select Market. The stockholders' approval enabled features of the warrants that required the vested warrants of the first tranche and the warrants of the second quarter and first quarterthird tranches to be classified as financial instruments as of 2017, 1.3May 12, 2016. Accordingly, the fair value of those warrants was measured and classified in liabilities on that date. Since May 12, 2016, 5.12 million additional warrants in the first tranche vested in conjunction with the execution of twoeight aircraft leases during each quarter.leases. As of June 30, 2017,March 31, 2018, the Company's liabilities reflected 13.6214.83 million warrants having a fair value of $13.06$14.45 per share. As of June 30, 2017, theThe re-measurements of the warrants to fair value resulted in a non-operating loss of $67.3$3.1 million and a gain of $1.7 million before the effect of income taxes. As of June 30,taxes for the three month periods ending March 31, 2018 and 2017, an additional 1.3 million warrants are expected to vest as AFS leases the two remaining aircraft from the Company.respectively.
The Company's earnings in future periods will be impacted by the number of warrants granted, the re-measurements of warrant fair value, amortizations of the lease incentive asset and the related income tax effects. For income tax calculations, the value and timing of related tax deductions will differ from the guidance described above for financial reporting.
U.S. Military
A substantial portion of the Company's revenues is also derived from the U.S. Military. The U.S. Military awards flights to U.S. certificated airlines through annual contracts and through temporary "expansion" routes. Revenues from services performed for the U.S. Military were approximately 7%11% and 7% of the Company's total revenues from continuing operations for the three and six month periods ending June 30,March 31, 2018 and 2017, respectively, compared to 13% and 14%respectively. Revenues excluding directly reimbursed expenses from continuing operations performed for Amazon comprised approximately 10% of the Company's consolidated revenues from continuing operations for the corresponding periods of 2016.three month period ending March 31, 2017. The Company's balance sheets included accounts receivable with the U.S. Military of $7.08.0 million and $7.06.7 million as of June 30, 2017March 31, 2018 and December 31, 2016,2017, respectively.

NOTE C—GOODWILL, INTANGIBLES AND EQUITY INVESTMENTS
OnThe Company's assets for CAM and the MRO Services segments each include goodwill. An annual impairment test was performed for each, respectively, at December, 30, 2016, the Company purchased 100%31, 2017 using industry market multiples and discounted cash flows utilizing a market-derived rate of the outstanding stock of Pemco World Air Services Inc., ("Pemco") for cash consideration in a debt-free acquisition. The purchase price has been allocated to tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values at the date of


acquisition. The excess purchase price over the estimatedreturn (level 3 fair value of net assets acquiredinputs). Goodwill was recorded as goodwill and reflects the strategic value of marketing Pemco's aircraft conversion capabilities and current aircraft hangar operations with the Company's air transportation solutions. Identified intangible assets include Supplemental Type Certificates ("STCs") granting approval by FAA for Pemco to market and complete certain aircraft modifications. The Company is in the process of refining its estimates of certain assets including goodwill and intangible assets, therefore the allocation of purchase price is preliminary at this time. The consolidated statements of operations includes the revenues and expenses for Pemco for the periods after its acquisition by the Company. The consolidated statements of operations reflect the reclassification of certain previously reported operating expenses to conform to the current presentation.not impaired.
The carrying amounts of goodwill are as follows (in thousands):
  CAM All Other Total
Carrying value as of December 31, 2016 $34,395
 $2,738
 $37,133
Purchase price adjustment 
 146
 146
Carrying value as of June 30, 2017 $34,395
 $2,884
 $37,279
  CAM MRO Services Total
Carrying value as of December 31, 2017 $34,395
 $2,884
 $37,279
Carrying value as of March 31, 2018 $34,395
 $2,884
 $37,279


The Company's acquired intangible assets are as follows (in thousands):
  Airline Amortizing  
  Certificates Intangibles Total
Carrying value as of December 31, 2016 $3,000
 $5,453
 $8,453
Amortization 
 (277) (277)
Carrying value as of June 30, 2017 $3,000
 $5,176
 $8,176
  Airline Amortizing  
  Certificates Intangibles Total
Carrying value as of December 31, 2017 $3,000
 $4,298
 $7,298
Amortization 
 (290) (290)
Carrying value as of March 31, 2018 $3,000
 $4,008
 $7,008
The airline certificates have an indefinite life and therefore are not amortized. The Company amortizes finite-lived intangibles assets, including customer relationship and STC intangibles, over 4 to 7 years.
Stock warrants issued to a lessee (see Note B) as an incentive are recorded as a lease incentive asset using their fair value at the time that the lessee has met its performance obligation and amortized against revenues over the duration of related aircraft leases. The Company's lease incentive granted to the lessee was as follows (in thousands):
  Lease
  Incentive
Carrying value as of December 31, 2017 $80,684
Amortization (4,226)
Carrying value as of March 31, 2018 $76,458
The lease incentive began to amortize in April 2016, with the commencement of certain aircraft leases over the duration of the related leases.
In January 2014, the Company acquired a 25 percent equity interest in West Atlantic AB of Gothenburg, Sweden ("West"). West, through its two airlines, Atlantic Airlines Ltd. and West Air Sweden AB, operates a fleet of aircraft on behalf of European regional mail carriers and express logistics providers. The airlines operate a combined fleet of British Aerospace ATPs, Bombardier CRJ-200-PFs, and Boeing 767 and 737 aircraft. West leases three Boeing 767 aircraft and one Boeing 737 from the Company. The Company accounts for West using the equity method of accounting. The Company’s carrying value of West was $9.0$7.6 million and $9.9$7.1 million at June 30, 2017March 31, 2018 and December 31, 2016,2017, respectively, including $5.5 million of excess purchase price over the Company's fair value of West's netnets assets in January of 2014. In 2017, the Company paid $2.4 million to West and entered into a preferred equity instrument. The carrying value isCompany's equity interest and the preferred equity instrument are reflected in “Other Assets” in the Company’s consolidated balance sheets.sheets as of March 31, 2018 and December 31, 2017.
Stock warrants issuedOn August 3, 2017 the Company entered into a joint-venture agreement with Precision Aircraft Solutions, LLC, to develop a lessee (see Note B) as an incentive are recorded aspassenger-to-freighter conversion program for Airbus A321-200 aircraft. The Company anticipates approval of a lease incentive asset using their fair value atsupplemental type certificate from the time thatFAA in 2019. The Company expects to make contributions equal to its 49% ownership percentage of the lessee has met its performance obligation and amortized against revenuesprogram's total costs over the durationnext two years. During the first three months of related aircraft leases. The Company's lease incentive granted2018, the company contributed $2.5 million to the lessee was as follows (in thousands):
  Lease
  Incentive
Carrying value as of December 31, 2016 $54,730
Warrants granted 22,784
Amortization (5,874)
Carrying value as of June 30, 2017 $71,640
joint venture. The lease incentive began to amortizeCompany accounts for its investment in April 2016, with the commencementjoint venture under the equity method of certain aircraft leases overaccounting, in which the durationcarrying value of the related leases.investment is reduced for the Company's share of the joint ventures operating losses. The carrying value of the joint venture, reflected in “Other Assets” in the Company’s consolidated balance sheets, was $5.5 million and $5.6 million at March 31, 2018 and December 31, 2017.


NOTE D—FAIR VALUE MEASUREMENTS
The Company’s money market funds and interest rate swaps are reported on the Company’s consolidated balance sheets at fair values based on market values from identical or comparable transactions. The fair value of the Company’s money market funds, stock warrantswarrant obligations, convertible note, convertible note hedges and interest rate swaps are based on observable inputs (Level 2) from comparable market transactions. The fair value of the stock warrant obligation wasobligations were determined using a Black-Scholes pricing model which considers the Company’s common stock price and various assumptions, such as the volatility of the Company’s common stock, the expected dividend yield, and the risk-free interest rate. The use of significant unobservable inputs (Level 3) was not necessary in determining the fair value of the Company’snote conversion obligations and the convertible note hedges were estimated

using a Black-Scholes pricing model and incorporate the terms and conditions of the underlying financial assetsinstruments. The valuations are, among other things, subject to changes in both the Company's credit worthiness and liabilities.the counter-parties to the instruments as well as change in general market conditions. While the change in fair value of the note conversion obligations and the convertible note hedges are generally expected to move in opposite directions, the net change in any given period may be material.
The following table reflects assets and liabilities that are measured at fair value on a recurring basis (in thousands):
 
As of June 30, 2017Fair Value Measurement Using Total
As of March 31, 2018Fair Value Measurement Using Total
Level 1 Level 2 Level 3 TotalLevel 1 Level 2 Level 3 
Assets             
Cash equivalents—money market$
 $25,957
 $
 $25,957
$
 $35,785
 $
 $35,785
Interest rate swap
 549
 
 549

 4,183
 
 4,183
Convertible note hedges
 56,046
 
 56,046
Total Assets$
 $26,506
 $
 $26,506
$
 $96,014
 $
 $96,014
Liabilities              
Interest rate swap$
 $(233) $
 $(233)
Stock warrant obligation
 (177,850) 
 (177,850)
Note conversion obligations
 (56,881) 
 (56,881)
Stock warrant obligations
 (214,205) 
 (214,205)
Total Liabilities$
 $(178,083) $
 $(178,083)$
 $(271,086) $
 $(271,086)
As of December 31, 2016Fair Value Measurement Using Total
As of December 31, 2017Fair Value Measurement Using Total
Level 1 Level 2 Level 3 TotalLevel 1 Level 2 Level 3 
Assets             
Cash equivalents—money market$
 $482
 $
 $482
$
 $1,326
 $
 $1,326
Interest rate swap
 547
 
 547

 1,840
 
 1,840
Convertible note hedges
 53,683
 
 53,683
Total Assets$
 $1,029
 $
 $1,029
$
 $56,849
 $
 $56,849
Liabilities              
Interest rate swap$
 $(77) $
 $(77)
Note conversion obligations
 (54,359) 
 (54,359)
Stock warrant obligation
 (89,441) 
 (89,441)
 (211,136) 
 (211,136)
Total Liabilities$
 $(89,518) $
 $(89,518)$
 $(265,495) $
 $(265,495)
As a result of lower market interest rates compared to the stated interest rates of the Company’s fixed and variable rate debt obligations, the fair value of the Company’s debt obligations, based on Level 2 observable inputs, was approximately $10.1$3.0 million more than the carrying value, which was $528.3530.4 million at June 30, 2017March 31, 2018. As of December 31, 2016,2017, the fair value of the Company’s debt obligations was approximately $0.2$9.1 million more than the carrying value, which was $458.7$515.8 million. The non-financial assets, including goodwill, intangible assets and property and equipment are measured at fair value on a non-recurring basis.


NOTE E—PROPERTY AND EQUIPMENT
The Company's property and equipment consists primarily of cargo aircraft, aircraft engines and other flight equipment. Property and equipment, to be held and used, is summarized as follows (in thousands):
 
June 30,
2017
 December 31,
2016
March 31,
2018
 December 31,
2017
Flight equipment$1,633,793
 $1,541,872
$1,799,301
 $1,801,808
Ground equipment50,734
 49,229
53,461
 53,523
Leasehold improvements, facilities and office equipment27,382
 27,364
28,205
 26,897
Aircraft modifications and projects in progress143,780
 113,518
164,414
 121,760
1,855,689
 1,731,983
2,045,381
 2,003,988
Accumulated depreciation(781,450) (730,991)(868,861) (844,026)
Property and equipment, net$1,074,239
 $1,000,992
$1,176,520
 $1,159,962
CAM owned aircraft with a carrying value of $590.7$705.2 million and $524.3$697.4 million that were under leases to external customers as of June 30, 2017March 31, 2018 and December 31, 2016,2017, respectively.
The Company’s accounting policy for major airframe and engine maintenance varies by subsidiary and aircraft type. The costs of airframe maintenance for ABX's Boeing 767-200 airframe maintenanceoperated by ABX are expensed as they are incurred. The costs of major airframe maintenance for the Company's other aircraft are capitalized and amortized over the useful life of the overhaul. Many of the Company's General Electric CF6 engines that power the Boeing 767-200 aircraft are maintained under “power by the hour” and "power by the cycle" agreements with an engine maintenance provider. Further, in May 2017, the Company entered into similar maintenance agreements for certain General Electric CF6 engines that power many of the Company's Boeing 767-300 aircraft. Under these agreements, the engines are maintained by the service provider for a fixed fee per cycle and/or flight hour. As a result, the cost of maintenance for these engines is generally expensed as flights occur. During their term, these maintenance agreements contain provisions for a minimum level of flight activity. Maintenance for the airlines’ other aircraft engines, including those powering Boeing 757 aircraft, are typically contracted to service providers on a time and material basis and the costs of those engine overhauls are capitalized and amortized over the useful life of the overhaul.

NOTE F—DEBT OBLIGATIONS
Long termDebt obligations consisted of the following (in thousands):
 
June 30, December 31,March 31, December 31,
2017 20162018 2017
Unsubordinated term loan$78,030
 $85,636
$66,857
 $70,568
Revolving credit facility445,000
 355,000
265,000
 245,000
Aircraft loans5,255
 18,085

 3,640
Total long term obligations528,285
 458,721
Convertible debt198,584
 196,550
Total debt obligations530,441
 515,758
Less: current portion(20,133) (29,306)(14,846) (18,512)
Total long term obligations, net$508,152
 $429,415
$515,595
 $497,246
The Company executed a syndicated credit agreement ("Senior Credit Agreement") in May 2011 which includes an unsubordinated term loan and a revolving credit facility. Effective March 31, 2017, the Company executed an amendment to the Senior Credit Agreement (the "Seventh Credit Agreement"). The Seventh Credit Agreementthat extended the maturity of the term loan and revolving credit facility to May 30, 2022, increased the capacity of the Revolvingrevolving credit facility by $120.0 million to $545.0 million and preserved the accordion feature such that the Company can stillnow draw up to an additional $100.0 million subject to the lenders' consent. Each year, through May 6, 2019, the Company may request a one year extension of the final maturity date, subject to the lenders' consent. In September 2017, the Company executed amendments to the Senior Credit Agreement.

These amendments increased the revolving credit facility's permitted additional indebtedness to $300.0 million for convertible notes described below. The amendments also increased the amount of dividends the Company can pay and the amount of common stock it can repurchase to $100.0 million during any calender year, provided the Company's total secured debt to earnings before interest, taxes, depreciation and amortization expenses ("EBITDA") ratio is under 3.00 times, after giving effect to the dividend or repurchase. As of March 31, 2018, the unused revolving credit facility has permitted additional indebtednesstotaled $270.7 million, net of $150.0draws of $265.0 million and outstanding letters of credit of $9.3 million.
The Senior Credit Agreement is collateralized by certain of the Company's Boeing 767 and 757 aircraft that are not collateralized under aircraft loans. Under the terms of the Senior Credit Agreement, the Company

is required to maintain collateral coverage equal to 125% of the outstanding balancesbalance of the term loan and the maximum capacity of revolving credit facility or 150% of the outstanding balance of the term loan and the total funded revolving credit facility, whichever is less. The minimum collateral coverage which must be maintained is 50% of the outstanding balance of the term loan plus the revolving credit facility commitment which was $545.0 million.
The balancesbalance of the unsubordinated term loan areis net of debt issuance costs of $0.7$0.6 million and $0.6$0.7 million for the periods ending June 30, 2017March 31, 2018 and December 31, 2016,2017, respectively. Under the terms of the Senior Credit Agreement, interest rates are adjusted quarterly based on the Company's earnings before interest, taxes, depreciation and amortization expenses ("EBITDA"),EBITDA, its outstanding debt level and prevailing LIBOR or prime rates. At the Company's current debt-to-EBITDA ratio, the LIBOR based financing for the unsubordinated term loan and revolving credit facility bear a variable interest rate of 3.23%3.38% and 3.23%3.38%, respectively. The Senior Credit Agreement provides foraircraft loan was paid off by the issuance of letters of credit on the Company's behalf. As of June 30, 2017, the unused revolving credit facility totaled $91.0 million, net of draws of $445.0 million and outstanding letters of credit of $9.0 million.Company in January 2018.
The aircraft loans are collateralized by two aircraft, and amortize monthly with a balloon payment of approximately 20% with maturities between 2017 and early 2018. Interest rates range from 6.74% to 6.82% per annum payable monthly.
The Senior Credit Agreement is collateralized by certain of the Company's Boeing 767 and 757 aircraft that are not collateralized under aircraft loans. The Senior Credit Agreement contains covenants including, among other things, limitations on certain additional indebtedness, guarantees of indebtedness, as well as a total debt to EBITDA ratio and a fixed charge coverage ratio. The Senior Credit Agreement stipulates events of default, including unspecified events that may have material adverse effects on the Company. If an event of default occurs, the Company may be forced to repay, renegotiate or replace the Senior Credit Agreement. The Senior Credit Agreement limits
In September 2017, the Company issued $258.8 million aggregate principal amount of dividends1.125% Convertible Senior Notes due 2024 ("Notes") in a private offering to qualified institutional buyers pursuant to Rule 144A under the Securities Act. The Notes bear interest at a rate of 1.125% per year payable semi-annually in arrears on April 15 and October 15 each year, beginning April 15, 2018. The Notes mature on October 15, 2024, unless repurchased or converted in accordance with their terms prior to such date. The Notes are unsecured indebtedness, subordinated to the Company's existing and future secured indebtedness and other liabilities, including trade payables. Conversion of the Notes can only occur upon satisfaction of certain conditions and during certain periods, beginning in any calendar quarter commencing after December 31, 2017 and thereafter, until the close of business on the second scheduled trading day immediately preceding the maturity date. Upon the occurrence of certain fundamental changes, holders of the Notes can require the Company can payto repurchase their notes at the cash repurchase price equal to the principal amount of the notes, plus any accrued and unpaid interest. Until the amountCompany's shareholders increase the number of authorized shares of common stock it can repurchase to cover the full number of shares underlying the Notes, the Company is required to settle conversions solely in cash. If the number of authorized shares is increased, the Notes may be settled in cash, the Company’s common shares or a combination of cash and the Company’s common shares, at the Company’s election. The initial conversion rate is 31.3475 common shares per $1,000 principal amount of Notes (equivalent to an initial conversion price of approximately $31.90 per common share). If a “make-whole fundamental change” (as defined in the offering circular with the Notes) occurs, the Company will, in certain circumstances, increase the conversion rate for a specified period of time.
The Company evaluated the conversion features of the Notes under the applicable accounting guidance including ASC 815, "Derivatives and Hedging,"$75.0 million during any calendar year, providedand determined that the conversion features require separate accounting as a derivative. At the time of issuance, the fair value of this derivative was recorded on the balance sheet as the note conversion obligations (a long-term liability) and an offsetting discount to the Notes. Until the Company's totalshareholders increase the number of authorized shares of common stock, the note conversion obligations will be adjusted to reflect its fair value at the end of each quarter. The fair value of the note conversion obligation at issuance was $57.4 million. The fair value of the note conversion obligations was $56.9 million and $54.4 million at March 31, 2018 and December 31, 2017, respectively, and resulted in a non-operating loss of $2.5 million before the effect of income tax during 2018.

The net proceeds from the issuance of the Notes were approximately $252.3 million, after deducting initial issuance costs. These unamortized issuance costs and discount are being amortized to interest expense through October 2024, using an effective interest rate of approximately 5.15%. The carrying value of the Company's Convertible debt to EBITDA ratio is under 2.75 times, after giving effectshown below:
  March 31, December 31,
  2018 2017
Principal value, Convertible Senior Notes, due 2024 258,750
 258,750
Unamortized issuance costs

 (6,479) (6,685)
Unamortized discount

 (53,687) (55,515)
Convertible debt 198,584
 196,550
In conjunction with the offering of the Notes, the Company also sold warrants to the dividend or repurchase.convertible note hedge counterparties in separate, privately negotiated warrant transactions at a higher strike price and for the same number of the Company’s common shares, subject to customary anti-dilution adjustments. The warrants could have a dilutive effect on the Company’s outstanding common shares and the Company’s earnings per share to the extent that the traded market price of the Company’s common shares exceeds the strike price of the warrants which is $41.35 per share and is subject to certain adjustments under the terms of the warrant transactions. In the event these warrants are exercised, the Company has enough authorized and unissued shares for their issuance. The amount received for these warrants and recorded in Stockholders' Equity in the Company’s consolidated balance sheets was $38.5 million. .

NOTE G—DERIVATIVE INSTRUMENTS
During September 2017, the Company issued convertible debt in the form of the Notes and recorded a long-term liability representing the Note conversion liability. In conjunction with the Notes, the Company purchased convertible note hedges having the same number of the Company’s common shares, 8.1 million shares, and same strike price of $31.90, that underlie the Notes. The convertible note hedges are expected to reduce the potential equity dilution with respect to the Company's common stock, and/or offset any cash payments in excess of the principal amount due, as the case may be, upon conversion of the Notes. The Company evaluated the convertible note hedges under the applicable accounting guidance, including ASC 815, "Derivatives and Hedging," and determined that the convertible note hedges should be accounted for as derivatives. These derivatives were capitalized on the balance sheet as long-term assets and are adjusted to reflect their fair value at the end of the quarter. The fair value of the convertible note hedges was $56.0 million and $53.7 million at March 31, 2018 and December 31, 2017, respectively. The Company recorded a net loss before the effects of income taxes of $0.2 million during the three month period ending March 31, 2018 for the revaluation of the convertible note hedges and the note conversion obligations to fair value.
The Company's Senior Credit Agreement requires the Company to maintain derivative instruments for protection from fluctuating interest rates, for at least fifty percent of the outstanding balance of the term loan. Accordingly, the Company entered into interest rate swaps. The table below provides information about the Company’s interest rate swaps (in thousands):
   March 31, 2018 December 31, 2017
Expiration Date
Stated
Interest
Rate
 
Notional
Amount
 
Market
Value
(Liability)
 
Notional
Amount
 
Market
Value
(Liability)
May 5, 20211.090% 33,750
 914
 35,625
 719
May 30, 20211.703% 33,750
 491
 35,625
 240
March 31, 20221.900% 50,000
 1,166
 50,000
 416
March 31, 20221.950% 75,000
 1,612
 75,000
 465

The outstanding interest rate swaps are not designated as hedges for accounting purposes. The effects of future fluctuations in LIBOR interest rates on derivatives held by the Company will result in the recording of unrealized gains and losses into the statement of operations. The Company recorded pre-tax gains on derivatives of $2.3 million and $0.2 million for the three month periods ending March 31, 2018 and 2017, respectively. The liability for outstanding derivatives is recorded in other liabilities and in accrued expenses.

NOTE H—COMMITMENTS AND CONTINGENCIES
Lease Commitments
The Company leases portions of the air park in Wilmington, Ohio, under lease agreements with a regional port authority, the terms of which expire in May of 2019 and June of 2036 with options to extend the leases. The leased facilities include corporate offices, 310,000 square feet of maintenance hangars and a 100,000 square foot component repair shop at the air park. ABX also has the non-exclusive right to use the airport, which includes one active runway, taxi ways and ramp space. The Company also leases and operates a 311,500 square foot, two hangar aircraft maintenance complex in Tampa, Florida. Additionally, the Company leases certain equipment and airport facilities, office space, and maintenance facilities at locations outsideother locations. As of March 31, 2018 and December 31, 2017, the airpark in Wilmington.Company did not lease any aircraft from lessors.
Purchase Commitments
The Company has agreements with Israel Aerospace Industries Ltd. ("IAI") for the conversion of Boeing 767 passenger aircraft into a standard configured freighter aircraft. The conversions primarily consist of the installation of a standard cargo door and loading system. At June 30, 2017,March 31, 2018, the Company was committed to acquire and modify additional Boeing 767-300 passenger aircraft into standard freighter aircraft. In addition to four Boeing 767-300eight aircraft that were in the modification process at June 30, 2017,March 31, 2018, the Company is committed to induct eightthree more aircraft into the freighter modification process through 2018, including commitments to purchase three more Boeing 767-300 passenger aircraft during the first half of 2018. As of June 30, 2017,March 31, 2018, the Company's commitments to complete the conversions of aircraft it owns or has the contracts to purchase totaled $172.1$101.7 million. Additionally, the Company could incur a cancellation fee for part kits for any aircraft that is not inducted into conversion at IAI.
Guarantees and Indemnifications
Certain leases and agreements of the Company contain guarantees and indemnification obligations to the lessor, or one or more other parties that are considered reasonable and customary (e.g. use, tax and environmental indemnifications), the terms of which range in duration and are often limited. Such indemnification obligations may continue after expiration of the respective lease or agreement.

Other
In September 2015, the Company entered into a joint venture agreement to establish an express cargo airline serving multiple destinations within the People's Republic of China (including Hong Kong, Macau and Taiwan) and surrounding countries, pending governmental approvals. The Company's contributions to the joint venture have been minimal and are expected to remain so over the next several months. Obtaining required governmental approvals for any new airline has since been delayed and as a result, the Company is evaluating alternatives. The Company is seeking to develop other aircraft investments in China by leveraging the relationship developed by Pemco, which provides modified Boeing 737 freighter aircraft in China.
On August 3, 2017 the Company ATSG entered into a joint-venture agreement with Precision Aircraft Solutions, LLC, to develop a passenger-to-freighter conversion program for Airbus A321-200 aircraft. The Company anticipates approval of a supplemental type certificate in 2019. The Company expects to make contributions equal to its 49% ownership percentage of the program's total costs over the next two years. The Company expects to account for its initial investment in the joint venture under the equity method of accounting.
In addition to the foregoing matters, the Company is also a party to legal proceedings including FAA enforcement actions, in various federal and state jurisdictions from time to time arising out of the operation of the Company's business. The amount of alleged liability, if any, from these proceedings cannot be determined with certainty; however, the Company believes that its ultimate liability, if any, arising from pending legal proceedings, as well as from asserted legal claims and known potential legal claims which are probable of assertion, taking into account established accruals for estimated liabilities, should not be material to our financial condition or results of operations.

Employees Under Collective Bargaining Agreements
As of June 30, 2017,March 31, 2018, the flight crewmember employees of ABX and ATI and flight attendant employees of ATI were represented by the labor unions listed below:
AirlineLabor Agreement Unit
Percentage of
the Company’s
Employees
ABXInternational Brotherhood of Teamsters9.3%8.2%
ATIAir Line Pilots Association7.7%7.6%
ATIAssociation of Flight Attendants1.2%
In addition, the Company has approximately 40 flight attendants that are represented by a recognized labor unit and are beginning to negotiate a collective bargaining agreement.

NOTE H—I—PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS
Defined Benefit and Post-retirement Healthcare Plans
ABX sponsors a qualified defined benefit pension plan for ABX crewmembers and a qualified defined benefit pension plan for a major portion of its other ABX employees that meet minimum eligibility requirements. ABX also sponsors non-qualified defined benefit pension plans for certain employees. These non-qualified plans are unfunded. Employees are no longer accruing benefits under any of the defined benefit pension plans. ABX also sponsors a post-retirement healthcare plan for its ABX employees, which is unfunded. Benefits for covered individuals terminate upon reaching age 65 under the post-retirement healthcare plans.
The accounting and valuation for these post-retirement obligations are determined by prescribed accounting and actuarial methods that consider a number of assumptions and estimates. The selection of appropriate assumptions and estimates is significant due to the long time period over which benefits will be accrued and paid. The long term nature of these benefit payouts increases the sensitivity of certain estimates of our post-retirement costs. The assumptions considered most sensitive in actuarially valuing ABX’s pension obligations and determining related expense amounts are discount rates and expected long term investment returns on plan assets. Additionally, other assumptions concerning retirement ages, mortality and employee turnover also affect the valuations. Actual results and future changes in these assumptions could result in future costs significantly higher than those recorded in our results of operations. Effective
ABX measures plan assets and benefit obligations as of December 31 2016, ABX modified its unfunded, non-pilot retiree medical plan to terminate benefits to all participants.

Retired participants were directed to publicof each year. Information regarding ABX’s sponsored defined benefit pension plans and post-retirement healthcare exchanges for more flexibleplans follow below. The accumulated benefit obligation reflects pension benefit obligations based on the actual earnings and lower cost alternatives. As a result, ABX settled all retiree medical obligations.service to-date of current employees.
The Company'sCompany’s net periodic benefit costs for its defined benefit pension plans and post-retirement healthcare plans for both continuing and discontinued operations are as follows (in thousands):
Three Months Ended June 30, Six Months Ended June 30,Three Months Ended March 31,
Pension Plans Post-Retirement Healthcare Plan Pension Plans Post-Retirement Healthcare PlanPension Plans Post-Retirement Healthcare Plan
2017 2016 2017 2016 2017 2016 2017 20162018 2017 2018 2017
Service cost$
 $
 $39
 $31
 $
 $
 $78
 $62
$
 $
 $30
 $39
Interest cost8,775
 8,968
 36
 42
 17,550
 17,936
 72
 84
7,284
 8,775
 32
 36
Expected return on plan assets(10,930) (10,264) 
 
 (21,859) (20,528) 
 
(10,523) (10,930) 
 
Amortization of prior service cost
 
 (13) (26) 
 
 (26) (52)
 
 
 (13)
Amortization of net loss1,937
 3,368
 71
 40
 3,874
 6,736
 142
 80
Net periodic benefit (income) cost$(218) $2,072
 $133
 $87
 $(435) $4,144
 $266
 $174
Amortization of net (gain) loss887
 1,937
 55
 71
Net periodic benefit cost (income)$(2,352) $(218) $117
 $133
During the sixthree month period ending June 30, 2017,March 31, 2018, the Company contributed $1.51.3 million to the pension plans. The Company expects to contribute an additional $3.1$21.1 million during the remainder of 2017.2018.


NOTE I—J—INCOME TAXES
The provision for income taxes for interim periods is based on management's best estimate of the effective income tax rate expected to be applicable for the current year, plus any adjustments arising from changes in the estimated amount of taxable income related to prior periods. Federal legislation known as the The Tax Cuts and Jobs Acts ("Tax Act") was enacted on December 22, 2017. The Tax Act reduces the U.S. federal corporate tax rate from the previous rate of 35% to 21% effective January 1, 2018. The Tax Act also makes broad and complex changes to the U.S. tax code, including, but not limited to a one time tax on earnings of certain foreign subsidiaries, limitations of net operating loss carryforwards created in tax years beginning after December 31, 2017, bonus depreciation for full expensing of qualified property, and limitations on the deductibility of certain executive compensation. The Company will continue to refine the calculations as additional analysis is completed and the Company gains a more thorough understanding of the Tax Act, including the tax law related to the deductibility of purchased assets, state tax treatment, and amounts related to employee compensation.
Income tax expense recorded through June 30, 2017March 31, 2018 utilized a projected annualized 38.8%23.9% rate applied to year-to-date income. Additionally, the Company recorded discrete tax items for the conversion of employee stock awards during the first quarter of 2017 and the issuance of stock warrants during the first quarter and second quarter of 2017,2018, resulting in an effective tax rate of (36.4)%25.1%. The final effective tax rate applied to 20172018 will depend on the actual amount of pre-tax book results by the Company for the full year, the additional conversions of employee stock awards, issuance of stock warrants and other items.
The Company has operating loss carryforwards for U.S. federal income tax purposes. Management expects to utilize the loss carryforwards to offset federal income tax liabilities in the future. Due to the Company's deferred tax assets, including its loss carryforwards, management does not expect to pay federal income taxes until 20192023 or later. The Company may, however, be required to pay alternative minimum taxessome federal tax due to loss carryforward usage limitations and certain state and local income taxes before then.


NOTE J—DERIVATIVE INSTRUMENTS
The Company's Senior Credit Agreement requires the Company to maintain derivative instruments for protection from fluctuating interest rates, for at least fifty percent of the outstanding balance of the term loan. Accordingly, the Company entered into interest rate swaps. The Company entered into two new interest rate swaps in February 2017 and April 2017, respectively, having an initial value of $39.4 million and $50.0 million, respectively, and forward start dates of June 30, 2017. Under these swaps, the Company pays a fixed rate of 1.703% and 1.9%, respectively, and receives a floating rate that resets monthly based on LIBOR. The table below provides information about the Company’s interest rate swaps (in thousands):
   June 30, 2017 December 31, 2016
Expiration Date
Stated
Interest
Rate
 
Notional
Amount
 
Market
Value
(Liability)
 
Notional
Amount
 
Market
Value
(Liability)
June 30, 20171.183% 
 
 43,125
 (77)
May 5, 20211.090% 39,375
 549
 43,125
 547
May 30, 20211.703% 39,375
 (54) 
 
March 31, 20221.900% 50,000
 (179) 
 
The outstanding interest rate swaps are not designated as hedges for accounting purposes. The effects of future fluctuations in LIBOR interest rates on derivatives held by the Company will result in the recording of unrealized gains and losses into the statement of operations. The Company recorded the net loss on derivatives of $0.2 million and $0.3 million for the six month periods ending June 30, 2017 and 2016, respectively. The asset for outstanding derivatives is recorded in other assets. The liability for outstanding derivatives is recorded in other liabilities and in accrued expenses.


NOTE K—ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Accumulated other comprehensive income (loss) includes the following items by components for the three and six month periods ending June 30,March 31, 2018 and 2017 and 2016 (in thousands):
  Defined Benefit Pension Defined Benefit Post-Retirement Foreign Currency Translation Total
Balance as of March 31, 2016 (95,156) (306) (1,138) (96,600)
Other comprehensive income (loss) before reclassifications:        
Foreign currency translation adjustment 
 
 80
 80
Amounts reclassified from accumulated other comprehensive income:        
Actuarial costs (reclassified to salaries, wages and benefits) 3,368
 40
 
 3,408
Negative prior service cost (reclassified to salaries, wages and benefits) 
 (26) 
 (26)
Income tax expense (1,222) (5) (27) (1,254)
Other comprehensive income, net of tax 2,146
 9
 53
 2,208
Balance as of June 30, 2016 (93,010) (297) (1,085) (94,392)
         
Balance as of December 31, 2015 (97,302) (315) (1,395) (99,012)
Other comprehensive income (loss) before reclassifications:        
Foreign currency translation adjustment 
 
 472
 472
Amounts reclassified from accumulated other comprehensive income:        
Actuarial costs (reclassified to salaries, wages and benefits) 6,736
 80
 
 6,816
Negative prior service cost (reclassified to salaries, wages and benefits) 
 (52) 
 (52)
Income tax expense (2,444) (10) (162) (2,616)
Other comprehensive income, net of tax 4,292
 18
 310
 4,620
Balance as of June 30, 2016 (93,010) (297) (1,085) (94,392)

  Defined Benefit Pension Defined Benefit Post-Retirement Foreign Currency Translation Total
Balance as of March 31, 2017 (75,854) (1,264) (1,440) (78,558)
Other comprehensive income (loss) before reclassifications:        
Foreign currency translation adjustment 
 
 152
 152
Amounts reclassified from accumulated other comprehensive income:        
Actuarial costs (reclassified to salaries, wages and benefits) 1,937
 71
 
 2,008
Negative prior service cost (reclassified to salaries, wages and benefits) 
 (13) 
 (13)
Income tax expense (702) (21) (53) (776)
Other comprehensive income, net of tax 1,235
 37
 99
 1,371
Balance as of June 30, 2017 (74,619) (1,227) (1,341) (77,187)
         
Balance as of December 31, 2016 (77,088) (1,301) (1,477) (79,866)
Other comprehensive income (loss) before reclassifications:        
Foreign currency translation adjustment 
 
 210
 210
Amounts reclassified from accumulated other comprehensive income:        
Actuarial costs (reclassified to salaries, wages and benefits) 3,874
 142
 
 4,016
Negative prior service cost (reclassified to salaries, wages and benefits) 
 (26) 
 (26)
Income tax expense (1,405) (42) (74) (1,521)
Other comprehensive income, net of tax 2,469
 74
 136
 2,679
Balance as of June 30, 2017 (74,619) (1,227) (1,341) (77,187)
  Defined Benefit Pension Defined Benefit Post-Retirement Foreign Currency Translation Total
Balance as of December 31, 2016 (77,088) (1,301) (1,477) (79,866)
Other comprehensive income (loss) before reclassifications:        
Foreign currency translation adjustment 
 
 58
 58
Amounts reclassified from accumulated other comprehensive income:        
Actuarial costs (reclassified to non-service costs) 1,937
 71
 
 2,008
Negative prior service cost 
 (13) 
 (13)
Income Tax (Expense) or Benefit (703) (21) (21) (745)
Other comprehensive income (loss), net of tax 1,234
 37
 37
 1,308
Balance as of March 31, 2017 (75,854) (1,264) (1,440) (78,558)
         
  Defined Benefit Pension Defined Benefit Post-Retirement Foreign Currency Translation Total
Balance as of December 31, 2017 (60,575) (1,097) (1,348) (63,020)
Other comprehensive income (loss) before reclassifications:        
Foreign currency translation adjustment 
 
 (25) (25)
Amounts reclassified from accumulated other comprehensive income:        
Actuarial costs (reclassified to non-service costs) 887
 55
 
 942
Income Tax (Expense) or Benefit (200) (13) 9
 (204)
Other comprehensive income (loss), net of tax 687
 42
 (16) 713
Balance as of March 31, 2018 (59,888) (1,055) (1,364) (62,307)

NOTE L—STOCK-BASED COMPENSATION
The Company's Board of Directors has granted stock incentive awards to certain employees and board members pursuant to a long term incentive plan which was approved by the Company's stockholders in May 2005 and in May 2015. Employees have been awarded non-vested stock units with performance conditions, non-vested stock units with market conditions and non-vested restricted stock. The restrictions on the non-vested restricted stock awards lapse at the end of a specified service period, which is typically approximately three years from the date of grant. Restrictions could lapse sooner upon a business combination, death, disability or after an employee qualifies for retirement. The non-vested stock units will be converted into a number of shares of Company stock depending on performance and market conditions at the end of a specified service period, lasting approximately three years. The performance condition awards will be converted into a number of shares of Company stock based on the Company's average return on invested capital during the service period. Similarly, the market condition awards will be converted into a number of shares depending on the appreciation of the Company's stock compared to the NASDAQ Transportation Index. Board members were granted time-based awards with vesting periods of approximately six or twelve months. The Company expects to settle all of the stock unit awards by issuing new shares of stock. The table below summarizes award activity.
Six Months EndedThree Months Ended
June 30, 2017 June 30, 2016March 31, 2018 March 31, 2017
Number of
Awards
 
Weighted
average
grant-date
fair value
 
Number of
Awards
 
Weighted
average
grant-date
fair value
Number of
Awards
 
Weighted
average
grant-date
fair value
 
Number of
Awards
 
Weighted
average
grant-date
fair value
Outstanding at beginning of period1,040,569
 $9.97
 1,157,659
 $7.52
873,849
 $12.30
 1,040,569
 $9.97
Granted243,940
 17.52
 294,060
 15.43
206,695
 26.53
 243,940
 17.52
Converted(173,210) 9.69
 (160,500) 7.20
(96,616) 10.89
 (173,210) 9.69
Expired
 
 
 

 
 
 
Forfeited(3,800) 13.66
 (9,200) 10.23

 
 (3,800) 13.66
Outstanding at end of period1,107,499
 $11.66
 1,282,019
 $9.36
983,928
 $15.43
 1,107,499
 $11.66
Vested324,599
 $6.39
 338,919
 $6.12
326,928
 $7.18
 324,599
 $6.39
The average grant-date fair value of each performance condition award, non-vested restricted stock award and time-based award granted by the Company in 20172018 was $16.7225.15, the fair value of the Company’s stock on the date of grant. The average grant-date fair value of each market condition award granted in 20172018 was $20.1831.60. The market condition awards were valued using a Monte Carlo simulation technique, a risk-free interest rate of 1.7%2.4% and a volatility of 34.7%33.8% based on volatility over three years using daily stock prices.
For the six month periods ending June 30,March 31, 2018 and 2017, and 2016, the Company recorded expense of $1.71.0 million and $1.60.8 million, respectively, for stock incentive awards. At June 30, 2017,March 31, 2018, there was $5.6$8.5 million of unrecognized expense related to the stock incentive awards that is expected to be recognized over a weighted-average period of 1.61.8 years. As of June 30, 2017,March 31, 2018, none of the awards were convertible, 324,599326,928 units of the Board members time-based awards had vested and none of the outstanding shares of the restricted stock had vested. These awards could result in a maximum number of 1,360,4741,219,878 additional outstanding shares of the Company’s common stock depending on service, performance and market results through December 31, 2019.2020.


NOTE M—COMMON STOCK AND EARNINGS PER SHARE
Earnings per Share
The calculation of basic and diluted earnings per common share are as follows (in thousands, except per share amounts):
 Three Months Ended Six Months Ended
 June 30, June 30,
 2017 2016 2017 2016
Numerator:       
Earnings (loss) from continuing operations - basic$(53,918) $11,528
 $(44,122) $19,699
Gain from stock warrant revaluation, net of tax
 (3,664) 
 (3,405)
Earnings (loss) from continuing operations - diluted$(53,918) $7,864
 $(44,122) $16,294
        
Denominator:       
Weighted-average shares outstanding - basic59,035
 63,267
 59,084
 63,452
Common equivalent shares:       
Effect of stock-based compensation awards
 861
 
 835
Effect of stock warrants
 2,635
 
 1,623
Weighted-average shares outstanding assuming dilution59,035
 66,763
 59,084
 65,910
        
Basic earnings (loss) per share from continuing operations$(0.91) $0.18
 $(0.75) $0.31
Diluted earnings (loss) per share from continuing operations$(0.91) $0.12
 $(0.75) $0.25
 Three Months Ending March 31,
 2018 2017
Numerator:   
Earnings from continuing operations - basic$15,682
 $9,796
Gain from stock warrants revaluation, net of tax
 (1,539)
Earnings from continuing operations - diluted$15,682
 $8,257
    
Denominator:   
Weighted-average shares outstanding for basic earnings per share58,840
 59,133
Common equivalent shares:   
Effect of stock-based compensation awards and warrants718
 5,816
Weighted-average shares outstanding assuming dilution59,558
 64,949
Basic earnings per share from continuing operations$0.27
 $0.17
Diluted earnings per share from continuing operations$0.26
 $0.13
The determination of diluted earnings per share requires the exclusion of the fair value re-measurement of the stock warrants recorded as a liability (see Note B), if such warrants have ana anti-dilutive effect on earnings per share. ForThe dilutive effect of the weighted-average diluted shares outstanding is calculated using the treasury method for periods in which equivalent shares have a dilutive effect on earnings per share, the weighted-average diluted shares outstanding is calculated using the treasury method.share. Under this method, the number of diluted shares is determined by dividing the assumed proceeds of the warrants recorded as a liability by the average stock price during the period and comparing that amount with the number of corresponding warrants outstanding.
The underlying warrants recorded as a liability as of June 30,March 31, 2018 and 2017 could resultwould have resulted in 13.614.8 million and 12.3 million additional shares of the Company's common stock, respectively, if the warrants were settled by tendering cash. The warrants recorded in stockholders' equity as of March 31, 2018, would have resulted in 8.1 million additional shares of the Company's common stock, if the warrants are settled by tendering cash. The number of equivalent shares that were not included in weighted average shares outstanding assuming dilution, because their effect would have been anti-dilutive, were 8.5 million and 7.2 million for the three and six month periods ended June 30, 2017, respectively, compared to none for the corresponding periods of 2016.
Purchase of Common Stock
The Company's Board of Directors has authorized management to repurchase outstanding common stock of the Company from time to time on the open market or in privately negotiated transactions. The authorization does not require the Company to repurchase a specific number of sharesprice exceeded $41.35 and the Company may terminate the repurchase program at any time. Upon the retirement of common stock repurchased, the excess purchase price over the par value for retired shares of common stock is recorded to additional paid-in-capital.
The Company repurchased common stock during the first six months of 2017, including 380,637 shares on June 6, 2017 from an underwriterwarrants were settled in conjunction with an underwritten secondary offering by its largest shareholder, Red Mountain Partners, L.P., a fund that is affiliated with Red Mountain Capital Partners, LLC (“Red Mountain”), a related party, for an aggregate purchase price of $8.5 million. The share price of $22.42 was equal to the price per share paid by the underwriter to Red Mountain.shares.


NOTE N—SEGMENT AND REVENUE INFORMATION
The Company operates in twothree reportable segments. The CAM segment consists of the Company's aircraft leasing operations and its segment earnings includesinclude an allocation of interest expense. The ACMI Services segment consists of the Company's airline operations, including CMI agreements as well as ACMI and charter service agreements that the Company has with its customers. The MRO Services segment provides aircraft parts, component repairs, airframe maintenance services, aircraft modifications and other customers. Dueaircraft maintenance services. The MRO Services became reportable during 2018 due to the similarities among thesize of its revenues. Prior periods presented below have been prepared by separating MRO Services from "All other" for comparative purposes. The Company's airline operations, the airline operations are aggregated into a single reportable segment, ACMI Services. The Company'sground services and other activities, which include the mail and parcel handlingpackage sorting services, as well as hub managementmaintenance services for the USPS and AFS, the sale of aircraft parts, aircraft maintenance services, aircraft modifications, facility and ground equipment, services,facilities and material handling equipment, the sales of aviation fuel and other services, are not large enough to constitute reportable segments and are combined in “All other” with inter-segment profit eliminations.All other. Inter-segment revenues are valued at arms-length market rates. Cash and cash equivalents are reflected in Assets - All other below.
The Company's segment information for revenue from continuing operations is presented below (in thousands):
Three Months Ending June 30, Six Months Ending June 30,Three Months Ending March 31
2017 2016 2017 20162018 2017
Total revenues:          
CAM$49,530
 $47,439
 $97,508
 $99,165
$52,376
 $47,978
ACMI Services144,499
 114,145
 289,448
 229,101
119,374
 144,949
MRO Services52,723
 40,338
All other116,508
 57,253
 205,714
 112,264
19,283
 48,868
Eliminate inter-segment revenues(57,326) (42,288) (101,542) (86,596)(40,716) (44,216)
Total$253,211
 $176,549
 $491,128
 $353,934
$203,040
 $237,917
Customer revenues:          
CAM$32,380
 $29,387
 $63,162
 $58,148
$35,887
 $30,782
ACMI Services144,499
 114,145
 289,448
 229,101
119,374
 144,949
MRO Services30,939
 25,417
All other76,332
 33,017
 138,518
 66,685
16,840
 36,769
Total$253,211
 $176,549
 $491,128
 $353,934
$203,040
 $237,917
Depreciation and amortization expense:       
CAM$26,253
 $22,607
 $50,554
 $45,337
ACMI Services10,491
 10,228
 21,563
 19,772
All other1,037
 297
 2,106
 557
Total$37,781
 $33,132
 $74,223
 $65,666
Segment earnings (loss):       
CAM$12,795
 $16,229
 $26,125
 $35,739
ACMI Services87
 (7,130) (3,618) (17,486)
All other6,539
 4,130
 11,322
 7,998
Net unallocated interest expense(216) (24) (387) (370)
Net gain (loss) on financial instruments(67,649) 5,558
 (65,780) 5,030
Pre-tax earnings (loss) from continuing operations$(48,444) $18,763
 $(32,338) $30,911

CAM's aircraft lease revenues are recognized as operating lease revenues on a straight-line basis over the term of the applicable lease agreements. CAM's customer revenues included $0.8 million and $2.7 million for the three month periods ending March 31, 2018 and 2017 respectively, for maintenance related payments from customers that are recognized at a point in time.
ACMI Services revenues are generated from airline service agreements and are typically based on hours flown, the amount of aircraft operated and crew resources provided during a month. ACMI Services revenues are recognized over time as flight hours are performed for the customer. Certain agreements include provisions for incentive payments based upon on-time reliability. These incentives are measured on a monthly basis and recorded to revenue in the corresponding month earned. Under CMI and ACMI agreements, customers are generally responsible for aviation fuel, landing fees, navigation fees and certain other flight expenses. When functioning as the customers agent for arranging such services, the Company records amounts reimbursable from the customer as revenues net of the related expenses as the costs are incurred. Under charter agreements in which the Company is responsible for fuel and full services, the related costs are recorded in operating expenses. During the three month period ended March 31, 2018, the Company netted $49.2 million of ACMI Services customer reimbursable revenues against the related expenses as an agent of customers. ACMI Services are invoiced monthly or more frequently.
MRO Services revenues for customer contracts for airframe and modification services that do not have an alternative use and for which the Company has an enforceable right to payment are generally recognized over time based on the

percentage of costs completed. MRO Services revenues for part sales, component repairs and line service are recognized at a point in time typically when the parts are delivered to the customer and the the services are completed. For airframe maintenance, aircraft modifications, and aircraft component repairs, contracts include assurance warranties that are not sold separately.
Effective January 1, 2018 the Company records revenues and estimated earnings for its airframe maintenance and modification contracts using the percentage-of-completion cost-to-cost method. For such services, the Company estimates the earnings on a contract as the difference between the expected revenue and estimated costs to complete a contract and recognizes revenues and earnings based on the proportion of costs incurred compared to the total estimated costs. The Company's estimates consider the timing and extent of the services, including the amount and rates of labor, materials and other resources required to perform the services. The Company recognizes adjustments in estimated earnings on a contract under the cumulative catch-up method in which the impact of the adjustment on estimated earnings of a contract is recognized in the period the adjustment is identified.
The Company's external customer revenues for providing sorting services and related equipment maintenance for the three month periods ending March 31, 2018 and 2017 were $16.2 million and $36.3 million, respectively, and are reported in All other. The Company's external customer revenues from providing sorting services are recognized as the services are performed for the customer over time. Revenues from related equipment maintenance services are primarily recognized at a point in time. During the three month period ended March 31, 2018, the Company netted $51.3 million of customer reimbursable revenues against the related expenses when functioning as the customers agent for arranging ground services.
Revenue is not recognized until collectibility of customer payment is probable. For customers that are not a governmental agency or department, the Company generally receives partial payment in advance of services, otherwise customer balances are typically paid within 30 to 60 days of service. During the three month periods ending March 31, 2018 the Company recognized $5.9 million of non lease revenue that was reported in deferred revenue at the beginning of the period.
The effects of the adoption of Topic 606 on the Company's customer revenues are summarized below:
  For the three months ending March 31, 2018
  Revenue
  As Reported Without Topic 606 Increase (decrease)
ACMI Services $119,374
 $168,549
 $(49,175)
MRO Services 30,939
 25,479
 5,460
Other (ground services) 16,840
 68,187
 (51,347)

The Company's other segment information from continuing operations is presented below (in thousands):
 Three Months Ending March 31
 2018 2017
Depreciation and amortization expense:   
CAM$28,925
 $24,301
ACMI Services10,225
 11,072
MRO Services850
 674
All other4
 395
Total$40,004
 $36,442
Segment earnings (loss):   
CAM$15,464
 $13,330
ACMI Services3,941
 (3,534)
MRO Services4,462
 3,188
     All other2,581
 2,463
Inter-segment earnings eliminated(3,325) (862)
Net unallocated interest expense(819) (171)
Net gain (loss) on financial instruments(885) 1,869
Other non-service components of retiree benefit costs, net2,045
 (177)
Loss from non-consolidated affiliate(2,536) 
Pre-tax earnings from continuing operations$20,928
 $16,106
The Company's assets are presented below by segment (in thousands):
June 30, December 31,March 31 December 31
2017 20162018 2017
Assets:      
CAM$1,081,308
 $971,986
$1,201,208
 $1,192,890
ACMI Services179,908
 164,489
195,790
 189,379
MRO Services96,451
 87,177
All other123,657
 122,855
74,054
 79,398
Total$1,384,873
 $1,259,330
$1,567,503
 $1,548,844
Interest expense allocated to CAM was $3.54.5 million and $6.9$3.3 million for the three and six month periods ending June 30, 2017, respectively, compared to $2.6 millionMarch 31, 2018 and $4.9 million for the corresponding periods of 2016,2017, respectively.
The Company's external customers revenues from other activities for the three and six month periods ended June 30, 2017 and 2016 are presented below (in thousands):
  Three Months Ended Six Months Ended
  June 30, June 30,
  2017 2016 2017 2016
Mail and package handling services $41,721
 $18,478
 $75,282
 $39,050
Aircraft maintenance, modifications and part sales 31,160
 11,450
 56,577
 21,260
Facility and ground equipment services 3,073
 2,682
 5,903
 5,500
Other 378
 407
 756
 875
Total customer revenues $76,332
 $33,017
 $138,518
 $66,685



ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
The following Management’s Discussion and Analysis has been prepared with reference to the historical financial condition and results of operations of Air Transport Services Group, Inc., and its subsidiaries. Air Transport Services Group, Inc. and its subsidiaries may hereinafter individually and collectively be referred to as "the Company", "we", "our" or "us" from time to time. The following discussion and analysis describes the principal factors affecting the results of operations, financial condition, cash flows, liquidity and capital resources. It should be read in conjunction with the accompanying unaudited condensed consolidated financial statements and the related notes prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") contained in this report and our Annual Report on Form 10-K for the year ended December 31, 2016.2017.

INTRODUCTION
The Company leases aircraft, provides air cargo lifttransportation and performs aircraft maintenance and other support services primarily to the air cargo transportation and package delivery industries. Through the Company's subsidiaries, we offer a range of complementary services to delivery companies, freight forwarders, e-commerce operators, airlines and government customers. The Company'sOur principal subsidiaries include two independently certificated airlines, ABX Air, Inc. (“ABX”) and Air Transport International, Inc. (“ATI”), and an aircraft leasing company, Cargo Aircraft Management, Inc. (“CAM”). CAM provides competitive aircraft lease rates by converting passenger aircraft into cargo freighters and offering them to customers under long-term leases.
The Company has twoWe have three reportable segments: CAM, which leases Boeing 767, Boeing 757 and Boeing 757737 aircraft and aircraft engines, and ACMI Services, which primarily includes the cargoair transportation operations of the Company's two airlines. The ACMIairlines, and MRO Services, segmentwhich provides airline operations to its customers. Services include a combination of aircraft crews, maintenance and insurance through "CMI" and "ACMI" agreements and through charter contracts in which aviation fuel is also included. The Company'smodification services to customers. Our other business operations, which primarily provide support services to the transportation industry, include aircraft maintenance, aircraft parts sales, groundmail and material handlingpackage sorting services as well as related equipment maintenance and mail handling services. These operations do not constitute reportable segments due to their size.
DHL
The Company has had long-term contracts withOur largest customers are DHL Network Operations (USA), Inc. and its affiliates ("DHL"), Amazon.com Services, Inc. ("ASI"), successor to Amazon Fulfillment Services, Inc., a subsidiary of Amazon.com, Inc. ("Amazon"), and the U.S. Military.
DHL
The Company has had long-term contracts with DHL since August 2003. DHL accounted for 26%28% of the Company's consolidated revenues for the first sixthree months of 2017,2018, compared with 36%30% of the Company's consolidated revenues excluding directly reimbursed revenues in the corresponding period in 2016.2017. As of June 30, 2017,March 31, 2018, the Company, through CAM, leased 1617 Boeing 767 aircraft to DHL, 1213 of which were being operated by the Company's airlines for DHL under a crew, maintenance and insurance agreement and four aircraft which are operated by a DHL-affiliated airline in the Middle East. Additionally, ATI operated four CAM-owned Boeing 757 aircraft under other operating arrangements with DHL.
Amazon
The Company has been providing freighter aircraft, operating flight services and services forarranging cargo handling and logistical support for Amazon Fulfillment Services, Inc. ("AFS"), a subsidiary of Amazon.com, Inc. ("Amazon")ASI since September 2015. On March 8, 2016, the Company entered into an Air Transportation Services Agreement (the “ATSA”) with AFSASI pursuant to which CAM willagreed to lease 20 Boeing 767 freighter aircraft to AFS, including 12 Boeing 767-200 freighter aircraft for a term of five years and eight Boeing 767-300 freighter aircraft for a term of seven years. As of June 30, 2017, the Company, through CAM, leased 12 Boeing 767-200 freighter aircraft and six Boeing 767-300 freighter aircraft to AFS. The ATSA, which has a term of five years, also provides for the operation of those aircraft by the Company’s airline subsidiaries, and the performance of hub and gateway services by the Company's subsidiary, LGSTX Services, Inc. ("LGSTX"). CAM owns all of the Boeing 767 aircraft that will beare leased and operated under the ATSA. The ATSA became effective on April 1, 2016.
Revenues from continuing operations performed for AFSASI comprised approximately 41%28% of the Company's consolidated revenues from continuing operations for the first sixthree months of 2017,2018, compared with 20%27% of the Company's consolidated revenues from continuing operationsexcluding directly reimbursed revenues during the corresponding period in 2016.2017.
In conjunction with the execution of the ATSA, the Company and Amazon entered into an Investment Agreement and a Stockholders Agreement on March 8, 2016. The Investment Agreement calls for the Company to issue warrants

in three tranches which grant Amazon the right to acquire up to 19.9% of the Company’s pre-transaction outstanding common shares measured on a GAAP-diluted basis, adjusted for share issuances and repurchases by the Company

following the date of the Investment Agreement and after giving effect to the warrants granted. The exercise price of the warrants is $9.73 per share, which represents the closing price of ATSG’sthe Company’s common shares on February 9, 2016. Warrants vest as AFS leases 20 aircraft from CAM. Each of the three tranches of warrants will be exercisable in accordance with its terms through March 8, 2021.
The Company’sOur accounting for the warrants issued to Amazon has been determined in accordance with the financial reporting guidance for equity-based payments to non-employees and for financial instruments. The fair value of the warrants issued or issuable to Amazon isare recorded as a lease incentive asset and isare amortized against revenues over the duration of the aircraft leases. The warrants are accounted for as financial instruments, and accordingly, the fair value of the outstanding warrants are measured and classified in liabilities at the end of each reporting period. The Company's earnings in future periods will be impacted by the numberAs of March 31, 2018, our liabilities reflected 14.83 million warrants granted, thehaving a fair value re-measurement of warrants at$14.45 per share. During the endfirst quarter of each period, lease incentive amortizations and2018, the related income tax effects. For income tax calculations, the value and timingre-measurements of related tax deductions will differ from the guidance described above for financial reporting. For additional information about the accounting for the warrants see Note B to fair value resulted in a non-operating loss of $3.1 million before the accompanying unaudited condensed consolidated financial statements.
U.S. Militaryeffect of income taxes.
The U.S. Military comprised 7%11% and 14%10% of the Company's consolidated revenues from continuing operationsexcluding directly reimbursed revenues during the sixthree month periods ending June 30,March 31, 2018 and 2017, and 2016, respectively. Revenues fromThe Company's airlines contract their services to the Air Mobility Command ("AMC"), through the U.S. MilitaryTransportation Command ("USTC"), both of which are primarily fororganized under the operationU.S. Military.
Fleet Summary 2018
As of March 31, 2018, the combined operating fleet of owned freighter aircraft consisted of 36 Boeing 767-200 aircraft, 25 Boeing 767-300 aircraft, four Boeing 757-200 aircraft, four Boeing 757 "combi" aircraft whichand one Boeing 737-400 aircraft. The Boeing 757 combi aircraft are capable of simultaneously carrying passengers and cargo containers on the main flight deck.
Fleet Summary 2017
As of June 30, 2017, the combined operating fleet of owned freighter aircraft consisted of 36 Boeing 767-200 aircraft, 20 Boeing 767-300 aircraft, four Boeing 757-200 aircraft and four Boeing 757 "combi" aircraft. At June 30, 2017,March 31, 2018, the Company owned sixeight Boeing 767-300 aircraft and twoone Boeing 737-400 aircraft that were either already undergoing or awaiting induction into the freighter conversion process.
Aircraft fleet activity during the first sixthree months of 20172018 is summarized below:
- CAM completed the modification of fourone Boeing 767-300 freighter aircraft purchased in the previous year and began to lease three of thosethat aircraft which are being operated by ATI, under a multi-year lease to AFS. CAM began to lease the fourthan external customer.
- ABX returned one Boeing 767-300 freighter aircraft to ATI.CAM. That aircraft was then leased to an external customer under a multi-year lease and is being operated by ABX.
- CAM leasedsold one Boeing 767-300 freighter aircraft, which was modified during 2016,under lease to AFS under a multi-year lease. ATI was separately contractedan external customer, to operate that aircraft.
- CAM leased one Boeing 767-200 freighter, which was being staged for leasing, to ATI.
- External lessees returned two Boeing 767-200 freighter aircraft to CAM. Two Boeing 767-200 aircraft were released tosame external customers.customer.
- CAM purchased three Boeing 767-300 passenger aircraft during the first quarter of 2017 for the purpose of converting the aircraft into standard freighter configuration.
- The Company purchased two Boeing 737-400 passenger aircraft during the first six months of 2017 for the purpose of converting the aircraft into standard freighter configuration.

The Company’s cargo aircraft fleet is summarized below as of June 30, 2017 and December 31, 2016:
June 30, 2017 December 31, 2016March 31, 2018 December 31, 2017
ACMI
Services
CAMTotal ACMI
Services
CAMTotal
ACMI
Services
CAMTotal ACMI
Services
CAMTotal
In-service aircraft      
Aircraft owned      
Boeing 767-2007
29
36
 6
29
35
7
29
36
 7
29
36
Boeing 767-3004
16
20
 4
12
16
3
22
25
 4
21
25
Boeing 757-2004

4
 4

4
4

4
 4

4
Boeing 757-200 Combi4

4
 4

4
4

4
 4

4
Boeing 737-400
1
1
 
1
1
Total19
45
64
 18
41
59
18
52
70
 19
51
70
Other aircraft      
Owned Boeing 767-300 under modification
6
6
 
7
7

8
8
 
6
6
Owned Boeing 737-400 under modification
2
2
 



1
1
 
1
1
Owned Boeing 767 available or staging for lease


 
1
1

As of June 30, 2017,March 31, 2018, ABX and ATI were leasing 1918 in-service aircraft internally from CAM for use in ACMI Services. As of June 30, 2017,March 31, 2018, six of CAM's 29 Boeing 767-200 aircraft shown in the aircraft fleet table above and sixseven of the 1622 Boeing 767-300 aircraft were leased to DHL and operated by ABX. Additionally, twelve12 of CAM's 29 Boeing 767-200 aircraft and sixeight of CAM's 1622 Boeing 767-300 aircraft were leased to AFSASI and operated by ABX or ATI. CAM leased the other eleven11 Boeing 767-200 aircraft and fourseven Boeing 767-300 aircraft to external customers, including four Boeing 767-200 aircraft to DHL that are being operated by a DHL-affiliatedDHL-owned airline. The carrying values of the total in-service fleet as of June 30, 2017 was $851.0 million compared to $793.9 million as ofMarch 31, 2018 and December 31, 2016.2017 were $940.3 million and $955.2 million, respectively. The table above does not reflect one Boeing 767-200 passenger aircraft owned by CAM.

RESULTS OF OPERATIONS
Summary
External customer revenues from continuing operations increaseddecreased by $76.7$34.9 million to $253.2$203.0 million and increased by $137.2 million to $491.1 million forduring the three and six month periods ended June 30, 2017, respectively,first quarter of 2018 compared to 2017. Effective January 1, 2018, the corresponding periodsCompany adopted Accounting Standards Update ("ASU") No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” ("Topic 606”). As a result of 2016. Excludingadopting Topic 606 beginning January 1, 2018 the Company reported certain revenues net of related expenses that are directly reimbursed by customers. Corresponding 2017 revenues include such reimbursements. Excluding revenues directly reimbursed in 2017, customer revenues increased $60.0$19.5 million, and $96.9 millionor 11% during the three and six month periods ended June 30, 2017, respectively,first quarter of 2018 compared to the corresponding periods of 2016.with 2017. External customer revenues increased due to additional aircraft leases from CAM's leasing operations, expanded ACMICMI and logistic services for AFS, additionalASI and aircraft maintenance and modification services and additional logistics services for AFS.various customers.
The consolidated net lossesearnings from continuing operations were $53.9 million and $44.1$15.7 million for the three and six month periods ended June 30, 2017, respectively,first quarter of 2018 compared to earnings of $11.5 million and $19.7$9.8 million for the corresponding periods of 2016.2017. The pre-tax lossesearnings from continuing operations were $48.4 million and $32.3$20.9 million for the three and six month periods ended June 30, 2017, respectively,first quarter of 2018 compared to pre-tax earnings of $18.8 million and $30.9$16.1 million, for the corresponding periods of 2016.2017. Earnings were affected by specific events and certain adjustments that do not directly reflect our underlying operations among the years presented. Net earnings from continuing operations for 2018 benefited from a lower effective tax rate due to The Tax Cuts and Jobs Acts ("Tax Act") which was enacted on December 22, 2017. On a pre-tax basis, earnings included net losses of $67.6$0.9 million and $65.8gains of $1.9 million for the three and six month periodsmonths ended June 30,March 31, 2018 and 2017, respectively, for the re-measurement of financial instruments, including the warrant obligations granted to Amazon, to fair value. This compares to pre-tax net gains for re-measurements of $5.6 million and $5.0 million for corresponding periods of 2016.Amazon. Pre-tax earnings were also reduced by $3.3$4.2 million and $5.9$2.6 million for the three and six month periodsmonths ended June 30,March 31, 2018 and 2017, respectively, for the amortization of lease incentives given to AFSASI in the form of warrants, compared to $0.9 million for both the corresponding periods of 2016.warrants. Additionally, pre-tax earnings from continuing operations included expensesa gain of $2.0 million and a loss of $0.2 million and $0.4 million for the threefirst quarters of 2018 and six month periods ending June 30, 2017, respectively, for the non-service componentcomponents of retiree benefit plan costs, compared to $2.2 million and $4.4 million for the corresponding periods of 2016.plans. Pre-tax earnings for the first quarter of 2016 also2018 included a $1.2$2.5 million chargeloss for the Company's share of capitalized debt issuancedevelopment costs that were charged off when West Atlantic AB,for a non-

consolidated affiliate, restructured its debt.new joint venture. After removing the effects of these items, adjusted pre-tax earnings from continuing operations, a non-GAAP measure (a definition and reconciliation of adjusted pre-tax earnings from continuing operations follows) were $22.7 million and $39.7$26.5 million for the three and six months ended June 30, 2017, respectively,first quarter of 2018 compared to $16.3 million and $32.5$17.0 million for 2016.2017, an increase of 56%.
Adjusted pre-tax earnings from continuing operations for the secondfirst quarter and first half of 20172018 improved compared to 2016,2017, driven primarily by additional revenues and the improved financial results of our airline operations. We also experienced additional revenues and earnings due to the acquisition of Pemco World Air Services, Inc. ("Pemco") in December 2016 and the expansion of gateway ground operations for AFS since June of 2016.ASI. This growth in revenue was partially offset by the cost necessary to support expanded flight operations, including training costs related to new flight crews, higher aircraft depreciation expense and more employee expenses, particularly in support of logistical services. Pre-tax earnings for the first quarter of 2018 included an additional interest expense of $2.1 million for the amortization of convertible debt discount and issuance costs.

A summary of our revenues and pre-tax earnings and adjusted pre-tax earnings from continuing operations is shown below (in thousands):
Three Months Ending June 30, Six Months Ending June 30,Three Months Ending March 31
2017 2016 2017 20162018 2017
Revenues from Continuing Operations:          
CAM          
Aircraft leasing and related revenues$52,813
 $48,373
 $103,382
 $100,099
Lease amortization against revenue(3,283) (934) (5,874) (934)
Aircraft leasing and related services$56,602
 $50,569
Lease incentive amortization(4,226) (2,591)
Total CAM49,530
 47,439
 97,508
 99,165
52,376
 47,978
ACMI Services       119,374
 108,066
Airline services111,851
 98,187
 219,917
 199,840
Reimbursable32,648
 15,958
 69,531
 29,261
Total ACMI Services144,499
 114,145
 289,448
 229,101
MRO Services52,723
 40,338
Other Activities116,508
 57,253
 205,714
 112,264
19,283
 31,398
Total Revenues310,537
 218,837
 592,670
 440,530
243,756
 227,780
Eliminate internal revenues(57,326) (42,288) (101,542) (86,596)(40,716) (44,216)
Customer Revenues - non reimbursed$203,040
 $183,564
Revenues for reimbursed expenses
 54,353
Customer Revenues$253,211
 $176,549
 $491,128
 $353,934
$203,040
 $237,917
          
          
Pre-Tax Earnings (Loss) from Continuing Operations:       
Pre-Tax Earnings from Continuing Operations:   
CAM, inclusive of interest expense$12,795
 $16,229
 $26,125
 $35,739
$15,464
 $13,330
ACMI Services87
 (7,130) (3,618) (17,486)3,941
 (3,534)
MRO Services4,462
 3,188
Other Activities6,539
 4,130
 11,322
 7,998
2,581
 2,463
Inter-segment earnings eliminated(3,325) (862)
Net unallocated interest expense(216) (24) (387) (370)(819) (171)
Net financial instrument re-measurement (loss) gain(67,649) 5,558
 (65,780) 5,030
(885) 1,869
Pre-Tax Earnings (Loss) from Continuing Operations(48,444) 18,763
 (32,338) 30,911
Other non-service components of retiree benefit costs, net2,045
 (177)
Loss from non-consolidated affiliate

(2,536) 
Pre-Tax Earnings from Continuing Operations20,928
 16,106
Add other non-service components of retiree benefit costs, net177
 2,203
 354
 4,406
(2,045) 177
Add debt issuance costs from non-consolidating affiliate
 
 
 1,229
Add charges for non-consolidated affiliate2,536
 
Add lease incentive amortization3,283
 934
 5,874
 934
4,226
 2,591
Add net loss (gain) on financial instruments67,649
 (5,558) 65,780
 (5,030)885
 (1,869)
Adjusted Pre-Tax Earnings from Continuing Operations$22,665
 $16,342
 $39,670
 $32,450
$26,530
 $17,005
Adjusted pre-tax earnings from continuing operations, a non-GAAP measure, is pre-tax earnings excluding other non-service components of retiree benefit costs, gains and losses for the fair value re-measurement of financial instruments, lease incentive amortizations and the charge offstart-up costs of debt issuance costs from a non-consolidated affiliate during the first quarter of 2016.joint venture. We exclude these items from adjusted pre-tax earnings because they are distinctly different in their predictability or not closely related to our on-going operating activities. Management uses adjusted pre-tax earnings to compare the performance of core operating results between periods. Presenting this measure provides investors with a comparative metric of fundamental operations while highlighting changes to certain items among periods. Adjusted pre-tax earnings should not be considered in isolation or as a substitute for analysis of the Company's results as reported under GAAP.

ACMI Reimbursable revenues shown above include revenues related toEffective January 1, 2018, we adopted Topic 606 using a modified retrospective approach, under which financial statements are prepared under the revised guidance for the year of adoption, but not for prior years. We determined that under Topic 606, the Company is an agent for aircraft fuel landing fees, navigation fees and certain other operating costs reimbursed under its ACMI and CMI contracts and for certain ground services that it arranges for ASI. Under the new standards, such reimbursed amounts are reported net of the corresponding expenses beginning in 2018. Revenues during the first quarter of 2017 included $54.4 million for reimbursable revenues under its ACMI and CMI contracts and directly reimbursed toground services, which under the airlines by their customers.new standard, have been reported net of the related expenses in 2018.

CAM Segment
CAM offers aircraft leasing and related services to external customers and also leases aircraft internally to the Company's airlines. CAM acquires passenger aircraft and manages the modification of the aircraft into freighters. The follow-on aircraft leases normally cover a term of five to eight years. In a typical leasing agreement, customers pay rent and maintenance deposits on a monthly basis.
As of June 30,March 31, 2018 and 2017, CAM had a fleet of 64 cargo aircraft in service condition, 19 of them leased internally to the Company's airlines52 and 45 leased to external customers. CAM has added eight aircraft to its operating fleet since July 1, 2016.
As of June 30, 2017 and 2016, CAM had 45 and 3543 aircraft under lease to external customers, respectively. CAM's revenues grew by $4.4 million during the first quarter of 2018 compared to 2017, primarily as a result of additional aircraft leases. Revenues from external customers totaled $32.4$35.9 million and $63.2$30.8 million for the threefirst quarters of 2018 and six month periods ending June 30, 2017, respectively, compared to $29.4 million and $58.1 million for the corresponding periods of 2016.respectively. CAM's revenues from the Company's airlines totaled $16.5 million during the first quarter of 2018, compared to $17.2 million and $34.3 million for the three and six month periods ending June 30, 2017, respectively, compared to $18.1 and $41.0 for the corresponding periods of 2016, reflecting the transition of CAM owned aircraft to long-term leases with external customers. CAM's aircraft leasing and related services revenues, which excludes customer lease incentive amortization, increased $4.4$6.0 million and $3.3 million duringin the three and six month periods ended June 30, 2017, respectively,first quarter of 2018 compared to the corresponding periods of 2016,2017, primarily as a result of new aircraft leases since Julyleases. Since April 1, 2016. Increased2017, CAM has added nine Boeing 767-300 freighter aircraft and one Boeing 737-400 freighter aircraft to its lease revenues were partially offset by lower maintenance revenues, spare engine leasing and parts sales compared to 2016; additionally during 2017 lease revenues were interrupted while transitioning aircraft between customers.portfolio.
CAM's pre-tax earnings were reduced by the increased amortization for the value of warrants issued to Amazon as a lease incentive. The amortization increased by $2.3 million and $4.9 million for the three and six months ended June 30, 2017 compared to the corresponding periods of 2016 due to additional vesting of warrants and a higher value of warrants at the time of vesting. CAM's pre-tax earnings, inclusive of aninternally allocated interest expense, allocation, were $12.8$15.5 million and $26.1$13.3 million during the threefirst quarters of 2018 and six month periods ended June 30, 2017, respectively, compared to $16.2 million and $35.7 million during the corresponding periods of 2016. Decreasedrespectively. Increased pre-tax earnings reflect moreadditional external lease revenues. These increases were partially offset by a $1.2 million increase in internally allocated interest expense due to higher debt levels, the $1.6 million increase in the amortization of the value of warrants issued to Amazon as aASI lease incentive, higherand $4.6 million more depreciation expense for eight additionaldriven by the addition of ten Boeing 767-300 aircraft increased interest allocation due toin the higher debt levels and reductions in maintenance related revenuesfirst quarter of 2018 compared to 2016.2017.
During the first sixthree months of 2017,2018, CAM purchased three 767-300 passenger aircraft for freighter conversion. CAM also sold one Boeing 767-300 aircraft which had been under a long-term lease to an external customer. As of June 30, 2017,March 31, 2018, all three of these Boeing 767-300 passenger aircraft and three otherthe Boeing 767-300 passenger aircraft purchased in 20162018 and five Boeing 767-300 passenger aircraft purchased during 2017 were being modified from passenger to freighter configuration. The Company also purchased twoone Boeing 737-400 aircraft during the first six months ofin 2017 and these aircraft are currentlywhich was being modified from passenger to freighter configuration.
CAM's agreement to lease 20 Boeing 767 freighter aircraft to AFS includes 12 Boeing 767-200 freighter aircraft for a term of five years and eight Boeing 767-300 freighter aircraft for a term of seven years. Leases for six of these aircraft began in April 2016 and twelve more were executedconfiguration as of May 1, 2017. To fulfill the 20 aircraft requirement for AFS, CAM leased a Boeing 767-300 freighter aircraft to AFS in July of 2017 and the twentieth aircraft is expected to be leased in August of 2017.March 31, 2018.
CAM currently expects to complete through the first quarter of 2018, the freighter modification of eightthe nine passenger aircraft which it owns. Whileowned at March 31, 2018. CAM has customer commitments andor letters of intent for mostseven of these aircraft,nine aircraft. CAM's future operating results will depend on the timing and lease rates under which these aircraft are ultimately leased. CAM's operating results will depend on its continuing ability to convert passenger aircraft into freighters within planned costs and within the time frames of customers' needs. Additionally, CAM's operating results will be negatively impactedrequired by the amortization of additional warrants issuable to Amazon as a lease incentive.customers.
ACMI Services Segment
The ACMI Services segment provides airline operations to its customers, typically under contracts providing for a combination of aircraft, crews, maintenance and insurance ("ACMI"). Our customers are usually responsible for

supplying the necessary aviation fuel and cargo handling services and reimbursing our airline for other operating expenses such as landing fees, ramp expenses, certain aircraft maintenance expenses and fuel procured directly by the airline. Aircraft charter agreements, including those for the U.S. Military, usually require the airline to provide full service, including fuel and other operating expenses for a fixed, all-inclusive price. As of June 30, 2017,March 31, 2018, ACMI Services included 4952 in-service aircraft, including 1918 leased internally from CAM, 1213 CAM-owned freighter aircraft which are under lease to DHL and operated by ABX under athe restated CMI agreement, and 1820 CAM-owned freighter aircraft which are under lease to AFSASI and operated by ATI and ABX under the ATSA.ATSA and another CAM-owned freighter operated by ATI.
Total revenues from ACMI Services increased $30.4 million and $60.3decreased $25.6 million during the three and six month periods ended June 30,first quarter of 2018 compared with 2017 to $144.5$119.4 million. ACMI Services revenues for the first quarter of 2017 included $36.9 million for the reimbursement of fuel and $289.4 million, respectively, compared tocertain operating expenses. Such revenues for 2018 are reported net of expenses after the corresponding periodsadoption of 2016.Topic 606. Airline services revenues from external customers, which do not include revenues for the reimbursement of fuel and certain operating expenses, increased $13.7 million and $20.1 million for the three and six month periods ended June 30, 2017, respectively, compared to the corresponding periods of 2016.$11.3 million. Improved revenues were driven by additional aircraft operations for AFSASI and reflect a 29%10% increase in billable block hours for both the three and six month periods ended June 30, 2017, compared to the corresponding periods of 2016.hours. As of June 30, 2017,March 31, 2018, ACMI Services were operatingincluded the operation of six more CAM-owned aircraft compared to June 30, 2016. Beginning in April 2016, in conjunction with the long-term leases executed between AFS and CAM, the related aircraft rent revenues for five aircraft operated for AFS during the first quarter of 2016 are reflected under CAM instead of ACMI Services.March 31, 2017.
ACMI Services had pre-tax earnings of $0.1 million and pre-tax losses of $3.6$3.9 million during the three and six month periods ended June 30, 2017, respectively,first quarter of 2018, compared to pre-tax losses of $7.1 million and $17.5$3.5 million for the corresponding periods of 2016. Improvements in2017. Improved pre-tax results in 20172018 compared to 20162017 were also affectedbolstered by expanded revenues, fewer scheduled airframe maintenance events during the first half of 2017,

and decreased pensionlower flight crew and related training expenses. Scheduled airframe maintenance expense decreased $1.7 million and $4.0increased $0.7 million during the three and six month periods ended June 30, 2017, respectively,first quarter of 2018 compared to the corresponding periods of 2016.2017. Airframe maintenance expense varies depending upon the number of C-checks and the scope of the checks required for those airframes scheduled for maintenance. Effective January 1, 2018, we adopted ASU "Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension expenseCost and Net Periodic Postretirement Benefit Cost "(ASU 2017-07"). As a result of adopting ASU 2017-07, the pre-tax earnings for ACMI Services includingdo not include the other non-service components of retiree benefit costs, decreased $2.0 million and $4.0 million as actuarially determinedcosts.
In March 2018, ATI began to implement recently ratified amendments to the collective bargaining agreement with its crewmembers. The amendments will result in increased wages for the three and six month periods ending June 30, 2017, respectively, compared to the corresponding periods of 2016.
In the third quarter of 2017, we expect to add two CAM-owned Boeing 767-300 aircraft into ACMI Service for AFS as the aircraft freighter modification is completed. Additionally, we expect the level of cost related to new crew training and ramp-up, which was $5.5 million during the first half of 2017, to declineATI crewmembers beginning in the second halfquarter of 2017. Achieving2018. ABX is negotiating with its flight crewmembers' collective bargaining unit. These negotiations could result in changes that may effect our productivity, employee compensation levels and the marketability of our services. Maintaining profitability in ACMI Services will depend on a number of factors, including customer flight schedules, revenue levels for airline services, crewmember productivity the level of pilot premiumand pay, employee benefits, aircraft maintenance schedules and the number of aircraft we operate.
MRO Services Segment
MRO Services sells aircraft parts and provides aircraft maintenance and modification services through the Company's Airborne Maintenance and Engineering Services, Inc. ("AMES") and Pemco World Air Services, Inc. ("Pemco"), subsidiaries.
Total revenues from MRO Services were $52.7 million and $40.3 million for the first quarter of 2018 and 2017, respectively. External customer revenues for MRO Services increased $5.5 million to $30.9 million for the first quarter of 2018 compared to the first quarter of 2017. Revenues increased during 2018 compared to 2017, reflecting increase in airframe maintenance and modification revenues. Revenues from aircraft maintenance services can vary among periods due to the timing of scheduled maintenance events and the completion level of work during a period. The pre-tax earnings from MRO Services increased by $1.3 million to $4.5 million in the first quarter of 2018, primarily reflecting expanded aircraft maintenance and modification services.
Other Activities
We provide relatedother support services to our ACMI Services customers and other airlines by leveraging our knowledge and capabilities developed for our own operations over the years. The Company's aircraft maintenance, engineering and repair businesses, Airborne Maintenance and Engineering Services, Inc. ("AMES") and Pemco, sell aircraft parts and provide aircraft maintenance and modification services. We also provide mail and package sorting parcel handling and logistical support to the U.S. Postal Service (“USPS”) at five USPS facilities and arrange similar services tofor certain AFS hubs andASI gateway locations in the U.S. We provide othermaintenance for ground services for our own airlinesequipment, facilities and external customers, including the sale ofmaterial handling equipment. We also resell aviation fuel the lease of ground equipment such as ground power unitsin Ohio and cargo loaders, as well as facility and equipment maintenance services.provide flight training.
External customer revenues from all other activities were $76.3decreased $19.9 million and $138.5to $16.8 million for 2017. Customer revenues in 2017 included $17.5 million for the three and six month periods ended June 30, 2017, respectively, compared to $33.0 million and $66.7 millionreimbursement of certain ground services that it arranges for ASI which are being net against expenses in 2018 after the corresponding periodsadoption of 2016.Topic 606. Revenues from our mail sorting, parcel handling and logistical support services increased $23.6 million and $36.6 million during the three and six month periods ended June 30, 2017, respectively, compared to 2016, reflecting higher contractual costs and additional AFS locations. Additionally, airframe maintenance revenues from external customers, increasedwhich do not include 2017 revenues for the reimbursement of certain ground services, decreased $2.5 million. The decrease in revenue was driven by $19.7 million and $35.3 million during the three and six month periods ended June 30,the termination of hub logistics services we provided through May of 2017 respectively, primarily due to the addition of Pemco, which was acquiredfor ASI at the end of 2016. Revenues from aircraft maintenance can vary among periods due to the timing of scheduled maintenance events and the completion level of work during a period.

airport in Wilmington, Ohio.
The pre-tax earnings from other activities increased by $2.4$0.1 million and $3.3to $2.6 million duringin the three and six month periods ended June 30, 2017 to $6.5 million and $11.3 million, respectively, compared to the corresponding periods in 2016, reflecting increased revenues. We expectfirst quarter of 2018. Additional earnings from parcel handling, logisticalhigher contractual costs and increased volumes at the USPS and ASI locations as well as earnings from an airline affiliate accounted for under the equity method were offset by reduced ground services and aviation fuel and other ground service to be negatively impacted during the second half of 2017 due to the transfer of AFS'ssales after ASI discontinued its hub operation from the airport in Wilmington, Ohio, whichOhio.
The contracts for five USPS facilities we operated,service have been extended from their original expiration dates and are currently scheduled to expire during September 2018. We understand the Cincinnati/Northern Kentucky International Airport.USPS is evaluating alternatives for these facilities. The contract for some or all of these may not be renewed.
Discontinued Operations
Pre-tax earnings related to former sorting operations were $0.6 million and $0.1 million for the first six months of 2017 and 2016, respectively. The financial results of discontinued operations primarily reflect the effects of defined benefit pension, plansworkers' compensation cost adjustments and other benefits for former employees that supported sortpreviously associated with ABX's former freight sorting and aircraft fueling services provided to DHL. Pre-tax earnings related to the former sorting operations under a hub service agreement with DHL.were $0.3 million for first quarters of 2018 and 2017.

Expenses from Continuing Operations
Salaries, wages and benefits expense increased $12.4 million and $32.6decreased $1.7 million during the three and six month periodsquarter ended June 30, 2017, respectively,March 31, 2018 compared to the corresponding periodsperiod of 2016 and reflect an 11% increase in the number of employees since June 30, 2016. Expenses increased $8.9 million and $18.3 million for the three and six month periods ended June 30, 2017 respectively, due to the acquisition of Pemco at the end of 2016. Increased expenses were also driven by higherlower headcount for flight operations, package handling servicesafter ASI discontinued its hub in Wilmington, Ohio in May 2017 and additional pilotless need for premium pay while newas additional flight crewmembers were being trained for our customers' expanding networks. Pension expense, including the non-service components of retiree benefit costs decreased $2.0 million and $4.0 million for the three and six month periods ended June 30, 2017, respectively, due to higher investment returns during the previous year.completed training.
Depreciation and amortization expense increased $4.6 million and $8.6$3.6 million during the three and six month periodsquarter ended June 30, 2017, respectively,March 31, 2018 compared to the corresponding periodsperiod of 2016.2017. The increase in depreciation expense reflects incremental depreciation for eightnine Boeing 767-300 aircraft and additionalone Boeing 737-400 aircraft engines added to the operating fleet since July, 2016, as well as capitalized heavy maintenance and navigation technology upgrades.April 1, 2017. We expect depreciation expense to increase during future periods in conjunction with our fleet expansion and capital spending plans.
Maintenance, materials and repairs expense increased by $7.2 million and $7.1$6.6 million during the three and six month periodsquarter ended June 30, 2017, respectively,March 31, 2018 compared to the corresponding periodsperiod of 2016.2017. The increase is primarilywas due to more airframe checks for the addition of Pemco'sCompany's airlines and additional costs to service increased external customer revenues for aircraft maintenance and materials, which added $11.4 million and $14.1 million of expenses for the three and six month periods ended June 30, 2017, respectively,modifications during 2018 compared to the corresponding periods of 2016. The additional expense from Pemco was partially offset by fewer airframe checks and related component repairs during the first quarter of 2017 compared to 2016.2017. Aircraft maintenance expenses and materials can vary among periods due to the number of scheduled airframe maintenance checks and the scope of the checks that are performed. In May 2017, our airlines entered into maintenance agreements for certain General Electric CF6 engines that power many of the Boeing 767-300 aircraft leased from CAM. Under the agreement, the engines are maintained by the service provider for a fixed fee per cycle. As a result, beginning in June 2017, the airlines began to record engine maintenance expense as flights occur. We estimate thatAccordingly, our airlines'airlines recorded an additional $1.7 million of engine maintenance expense will increase $3.0during 2018 compared to $4.0 million during the second halffirst three months of 2017, withwhich were partially offset by a partially offsetting reduction to engine depreciation expense.
Fuel expense increaseddecreased by $15.1 million and $33.3$29.1 million during the three and six month periodsquarter ended June 30, 2017, respectively,March 31, 2018 compared to the corresponding periodsperiod of 2016.2017. In 2017, fuel expense included reimbursable fuel billed to DHL, ASI and other ACMI customers which is being net against the revenue in 2018 after the adoption of Topic 606. The customer-reimbursed fuel for the first quarter of 2017 was $31.5 million. Fuel expense includes the cost of fuel to operate U.S. Military charters reimbursable fuel billed to DHL, AFS and other ACMI customers, as well as fuel used to position aircraft for service and for maintenance purposes. The increaseFuel expense for military customers and other purposes increased due to more block hours flown for military customers in fuel expense was driven by a higher levelthe first quarter of customer-reimbursed fuel which increased $16.0 million and $37.3 million for the three and six month periods ended June 30, 2017, respectively, compared to 2016.
Travel expense increased by $2.1 million and $4.7 million during the three and six month periods ended June 30, 2017, respectively, compared to the corresponding periods of 2016. The increase reflects the higher level of employee headcount in airline operations during 2017 compared to 2016.2018.
Contracted ground and aviation services expense includes navigational services, aircraft and cargo handling services and other airport services. Contracted ground and aviation services increased $23.2 million and $33.0decreased $18.3 million during the three and six month periodsquarter ended June 30, 2017, respectively,March 31, 2018 compared to the corresponding periodsperiod of 2016, due to additional logistical support services for AFS gateways.

Rent expense increased by $1.2 million and $1.8 million during the three and six month periods ended June 30, 2017, respectively, compared to the corresponding periods of 2016. Rent expense increased2017. The decrease is primarily due to the acquisitionnetting of Pemco andreimbursable revenues from certain ground services arranged for aircraft simulatorsASI against the expense in 2018 due to train new flight crews to support expanded customer networks.the adoption of Topic 606. The customer-reimbursed expenses in the first quarter of 2017 were $17.5 million.
Landing and ramp expense, which includes the cost of deicing chemicals, increaseddecreased by $1.7 million and $3.4$4.2 million during the three and six month periodsquarter ended June 30, 2017, respectively,March 31, 2018 compared to the corresponding periodsperiod of 2016, driven by additional flight operations. Landing2017. The decrease is primarily due to the netting of reimbursable revenues from landing and ramp fees can vary based onbilled to DHL, ASI and other ACMI customers against the flight schedules andexpense in 2018 due to the airports that are used in a period.adoption of Topic 606.
Other operating expenses increaseddecreased by $2.1 million and $3.2$0.8 million during the three and six month periodsquarter ended June 30, 2017, respectively,March 31, 2018 compared to the corresponding periodsperiod of 2016.2017. Other operating expenses include professional fees, employee training and utilities. Other operating expenses increased by $1.1 million and $1.9 millionalso includes improved operating results of an airline affiliate accounted for under the three and six month periods ended June 30, 2017, respectively, for the addition of Pemco, acquired at the end of 2016. Other operating expenses also increased due to pilot training costs for the expanded air networks.equity method.
Interest expense increased by $1.1 million and $2.0$1.8 million during the three and six month periodsquarter ended June 30, 2017, respectively,March 31, 2018 compared to the corresponding periodsperiod of 2016.2017. Interest expense increased due to a higher average debt level and interest rates on the Company's outstanding loans, offset by more capitalizedloans. Capitalized interest relateddue to our fleet expansion. Capitalized interest increased $0.2 million and $0.5expansion decreased $0.1 million during the three and six month periods ended June 30, 2017first quarter of 2018 to $0.6$0.4 million. Interest expense in the first quarter of 2018 was also impacted by the convertible notes issued in September 2017. The convertible notes have a principal value of $258.8 million and $1.0bear interest at a cash coupon rate of 1.125%. At the time of issuance, the value of the conversion feature of the convertible notes was recorded as a debt discount and is being amortized along with debt issuance cost to interest expense over the seven year term of the convertible notes. The non-cash amortization of the debt discount and issuance costs was $2.1 million respectively.during the first quarter of 2018.
The Company recorded pre-tax net losses on financial instruments of $67.6$0.9 million and $65.8 million forduring the three and six month periodsquarter ended June 30, 2017, respectively,March 31, 2018, compared to gains of $5.6 million and $5.0$1.9 million during the corresponding period of 2016.2017. The 2017 losses are primarily a result of re-measuring, as of June 30, 2017,March 31, 2018, the fair value of the stock warrants granted to Amazon. An increaseA decrease in the fair value of the warrants warrant obligation

since the previous re-measurement dates of MarchDecember 31, 2017, and December 31, 2016, corresponded to an increase in the traded price of the Company's shares and resulted in the non-cash loss.losses. The non-cash gains and losses resulting from quarterly re-measurements of the warrants may vary widely among quarters.
The provision for income taxes for interim periods is based on management's best estimate of the effective income tax rate expected to be applicable for the current year, plus any adjustments arising from changes in the estimated amount of taxable income related to prior periods. Income taxes recorded through June 30, 2017March 31, 2018 have been estimated utilizing a 23.9% rate based upon year-to-date income and projected annualized 38.8% rate applied to year-to-date income.results for the full year. The recognition of discrete tax items, such as the conversion of employee stock awards, the issuance of stock warrants and other items have an impact on the effective tax rate during a period.
The effective tax rate from continuing operations for the threequarter ended March 31, 2018 was 25.1% and six month periods ended June 30, 2017 was (11.3)% and (36.4)%, respectively. These effectiveincludes deferred tax rates reflectexpense related to the non deductible tax treatment of certain warrants vesting for Amazon and certain warrant revaluation lossesre-measurement loss at the end of the period. The effective tax rates for the three and six month periods ended June 30, 2017 are negative because the warrant revaluation losses do not generate a corresponding tax benefit for certain warrants. The effective tax rate withoutbefore including the effects of the warrants was 37.4%22.3% and 36.0%34.1% for the threefirst quarters of 2018 and six months periods ended June 30, 2017, respectively. The effective tax rate from continuing operationsdecreased for the three and six month periods ended June 30, 2016 were 38.6% and 36.3%, respectively. The effective tax rate without includingfirst quarter of 2018 due to the effectsenactment of the warrants, decreased for 2017 as operating income increased relative to non-deductible income tax expenses.Tax Act in December 2017.
As of December 31, 2016,2017, the Company had operating loss carryforwards for U.S. federal income tax purposes of approximately $40.2$57.6 million which will begin to expire in 2031 if not utilized before then. We expect to utilize the loss carryforwards to offset federal income tax liabilities in the future. As a result, we do not expect to pay federal income taxes until 20192023 or later. However, theThe Company may, however, be required to pay alternative minimum taxestax and certain state and local income taxes before then. The Company's taxable income earned from international flights are primarily sourced to the United States under international aviation agreements and treaties. When we operate in countries without such agreements, the Company could incur additional foreign income taxes.


FINANCIAL CONDITION, LIQUIDITY AND CAPITAL RESOURCES
Cash Flows
Net cash generated from operating activities totaled $124.868.8 million and $97.3$44.2 million for the first sixthree months ofin 2018 and 2017, and 2016, respectively. CashImproved cash flows generated from operating activities during 2018, were driven primarily by additional aircraft leases to customers, increased duringoperating levels of the first six monthsACMI Services segment, the collection of 2017, reflecting improved operating results and customer collections.peak season balances from customers. Cash outlays for pension contributions were $1.3 million and $0.8 million for the first sixthree months of 2018 and 2017, were $1.5 million compared to $1.0 million for the corresponding period of 2016.respectively.
Capital spending levels were primarily the result of aircraft modification costs and the acquisition of aircraft for freighter modification. Cash payments for capital expenditures were $144.379.1 million and $125.1$83.8 million for the first sixthree months of 20172018 and 2016,2017, respectively. Capital expenditures in 20172018 included $96.7$63.6 million for the acquisition of three Boeing 767-300 aircraft and two Boeing 737-400 aircraft and freighter modification costs; $31.3$9.2 million for required heavy maintenance; and $16.3$6.3 million for other equipment, including purchases of aircraft engines and rotables. Our capital expenditures during 2016in the first quarter of 2017 included $95.6$54.3 million for the acquisition of seventhree Boeing 767-300 aircraft and one Boeing 737-400 aircraft and freighter modification costs and next generation navigation modifications; $11.2costs; $21.0 million for required heavy maintenance; and $18.3$8.5 million for other equipment, including purchases of aircraft engines and rotables.
During the first quarter of 2018 we contributed an additional $2.5 million to a joint venture with Precision Aircraft Solutions, LLC, which is developing a passenger-to-freighter conversion program for Airbus A321-200 aircraft. During the first quarter of 2017 we paid $0.6 million to complete our acquisition of Pemco World Air Services, Inc.
Net cash provided by financing activities was $56.9$10.7 million for the first sixthree months of 20172018 compared to $35.3$46.8 million in 2016.2017. During the first sixthree months of 2017,2018, we drew $90.0$30.0 million from the revolving credit facility under the Senior Credit Agreement to fund capital spending.spending for aircraft acquisition and modifications. We made scheduled debt principal payments of $20.5$17.4 million. Our borrowing activities were necessary to acquire and modify aircraft for deployment into air cargo markets.
During the first six monthsquarter of 2017,2018, we spent $11.2 million to buy 530,637repurchased 157,000 shares of the Company's common stock pursuant to aan authorized share repurchase plan authorizedfor $3.6 million, of which $0.6 million was paid in 2014the first quarter and amended$3.0 million was paid in May 2016April 2018. The repurchase plan was amended by the Board of Directorsagain in February 2018 to increase the authorized share repurchase plan to up to $100 million of the Company's common stock.$150 million.

Commitments
We estimate that capital expenditures for 20172018 will total $335$300 million of which $265 millionthe majority will be related to aircraft purchases and freighter modifications. Actual capital spending for any future period will be impacted by aircraft acquisitions, maintenance and modification processes. We expect to finance the capital expenditures from current cash balances, future operating cash flow and the Senior Credit Agreement.Agreement, the latter of which we anticipate amending for the purpose of obtaining additional borrowing. The Company outsources a significant portion of the aircraft freighter modification process to a non-affiliated third party. The modification primarily consists of the installation of a standard cargo door and loading system. For additional information about the Company's aircraft modification obligations, see Note GH of the accompanying financial statements.
In September 2015,Since August 3, 2017, the Company entered intohas been part of a joint venture agreementjoint-venture with Precision Aircraft Solutions, LLC, to establish an express cargo airline serving multiple destinations withindevelop a passenger-to-freighter conversion program for Airbus A321-200 aircraft. We anticipate approval of a supplemental type certificate from the People's Republic of China (including Hong Kong, Macau and Taiwan) and surrounding countries, pending governmental approvals. The Company'sFAA in 2019. We expect to make contributions equal to the joint venture have been minimalCompany's 49% ownership percentage of the program's total costs during 2018 and are expected to remain so over the next several months. Obtaining required governmental approvals for any new airline has since been delayed and as a result, the Company is evaluating alternatives. The Company is seeking to develop other aircraft investments in China by leveraging the relationship developed by Pemco, which provides modified Boeing 737 freighter aircraft in China.2019.
Liquidity
The Company has a Senior Credit Agreement with a consortium of banks that includes an unsubordinated term loan of $78.0$66.9 million, net of debt issuance costs, and a revolving credit facility from which the Company has drawn $445.0$265.0 million, net of repayments, as of June 30, 2017.March 31, 2018. The revolving credit facility has a capacity of $545.0 million, permitted additional indebtedness of $150.0$300.0 million of which $258.8 million has been utilized for the issuance of convertible notes, and an accordion feature whereby the Company can draw up to an additional $100.0 million subject to the lenders' consent. The Senior Credit Agreement is collateralized by the Company's fleet of Boeing 767 and 757 aircraft that are not collateralized under aircraft loans.freighter aircraft. Under the amended terms of the Senior Credit Agreement, the Company is required to maintain collateral coverage equal to 125% of the outstanding balances of the term loan and the maximum capacity of the revolving credit facility or 150% of the outstanding balance of the term loan and the total funded revolving credit facility, whichever is less. The minimum collateral coverage which must be maintained is 50% of the outstanding balance of the term loan plus the revolving credit facility commitment which was $545.0 million. Each year, through May 6, 2019, the Company may request a

one year extension of the final maturity date, subject to the lenders' consent. Absent such future extensions, the maturity date is currently set to expire on May 30, 2022.
Under the Senior Credit Agreement, the Company is subject to covenants and warranties that are usual and customary including, among other things, limitations on certain additional indebtedness, guarantees of indebtedness, as well as a total debt to EBITDA ratio and a fixed charge coverage ratio. The Senior Credit Agreement stipulates events of default including unspecified events that may have a material adverse effect on the Company. If an event of default occurs, the Company may be forced to repay, renegotiate or replace the Senior Credit Agreement.
Additional debt or lower EBITDA may result in higher interest rates. Under the Senior Credit Agreement, interest rates are adjusted quarterly based on the prevailing LIBOR or prime rates and a ratio of the Company's outstanding debt level to EBITDA (earnings before interest, taxes, depreciation and amortization expenses). At the Company's current debt-to-EBITDA ratio, the unsubordinated term loan and the revolving credit facility both bear a variable interest rate of 3.23%3.38%.
At June 30, 2017,March 31, 2018, the Company had $63.0$47.5 million of cash balances. The Company had $91.0$270.7 million available under the revolving credit facility, net of outstanding letters of credit, which totaled $9.0$9.3 million. We believe that the Company's current cash balances and forecasted cash flows provided from its operating agreements, combined with its Senior Credit Agreement, will be sufficient to fund operations, capital spending, scheduled debt payments and required pension funding for at least the next 12 months.

Off-Balance Sheet Arrangements
As part of our ongoing business, we do not participate in transactions that generate relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities (“SPEs”), which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. As of June 30,March 31, 2018 and 2017, and 2016, we were not involved in any material unconsolidated SPE transactions.
Certain of our operating leases and agreements contain indemnification obligations to the lessor or one or more other parties that are considered usual and customary (e.g. use, tax and environmental indemnifications), the terms of which range in duration and are often limited. Such indemnification obligations may continue after the expiration of the respective lease or agreement. No amounts have been recognized in our financial statements for the underlying fair value of guarantees and indemnifications.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES
“Management’s Discussion and Analysis of Financial Condition and Results of Operations,” as well as certain disclosures included elsewhere in this report, are based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of these financial statements requires us to select appropriate accounting policies and make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosures of contingencies. In certain cases, there are alternative policies or estimation techniques which could be selected. On an ongoing basis, we evaluate our selection of policies and the estimation techniques we use, including those related to revenue recognition, post-retirement liabilities, bad debts, self-insurance reserves, valuation of spare parts inventory, useful lives, salvage values and impairment of property and equipment, income taxes, contingencies and litigation. The Company bases its estimates on historical experience, current conditions and on various other assumptions that are believed to be reasonable under the circumstances. Those factors form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources, as well as for identifying and assessing our accounting treatment with respect to commitments and contingencies. Actual results may differ from these estimates under different assumptions or conditions.
For information regarding recently issued accounting pronouncements and the expected impact on our annual statements, see Note A "SUMMARY OF FINANCIAL STATEMENT PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES" in the accompanying notes to the Condensed Consolidated Financial Statements included in Part II,I, Item 1 of this Form 10-Q.


ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
The Company is exposed to market risk for changes in interest rates and changes in the price of jet fuel. The risk associated with jet fuel, however, is largely mitigated by reimbursement through the agreements with our customers.
No significant changes have occurred to the market risks the Company faces since information about those risks were disclosed in item 7A of the Company's 20162017 Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 8, 2017.1, 2018.

ITEM 4. CONTROLS AND PROCEDURES
(a) Evaluation of Disclosure Controls and Procedures
As of June 30, 2017March 31, 2018, the Company carried out an evaluation, under the supervision and with the participation of the Company's Chief Executive Officer and Chief Financial Officer of the effectiveness of the design and operation of the Company's disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the "Exchange Act")). Based upon the evaluation, the Company's Chief Executive Officer and Chief Financial Officer concluded that the Company's disclosure controls and procedures were effective to ensure that information required to be disclosed by the Company in the reports filed or submitted by it under the Exchange Act is recorded, processed, summarized and reported within time periods specified in the Securities and Exchange Commission rules and forms and is accumulated and communicated to management, including the Chief


Executive Officer and Chief Financial Officer, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.
(b) Changes in Internal Controls
There were no changes in internal control over financial reporting during the most recently completed fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Company's internal control over financial reporting.


PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS
The Company isWe are currently a party to legal proceedings including FAA enforcement actions, in various federal and state jurisdictions from time to time arising out of the operation of the Company's business. The amount of alleged liability, if any, from these proceedings cannot be determined with certainty; however, we believe that the Company believes that itsCompany's ultimate liability, if any, arising from the pending legal proceedings, as well as from asserted legal claims and known potential legal claims which are probable of assertion, taking into account established accruals for estimated liabilities, should not be material to our financial condition or results of operations.

ITEM 1A. RISK FACTORS
The Company faces risks that could adversely affect its condition or results of operations. Many of these risks are disclosed in Item 1A of the Company's 20162017 Annual Report on form 10-K, filed with the Securities and Exchange Commission on March 8, 2017.1, 2018. The risk factors presented below update, and should be considered in addition to, the risk factors previously disclosed in Item 1A of the Company's 2017 Annual Report on Form 10-K. Other risks that are currently unknown to management or are currently considered immaterial or unlikely, could also adversely affect the Company.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS
On August 5, 2014, the Board of Directors authorized the Company to repurchase up to $50.0 million of outstanding common stock. In May 2016, the Board amended the Company's common stock repurchase program increasing the amount that management may repurchase from $50.0 million to $100.0 million of outstanding common stock. In February 2018, the Board again amended the common stock repurchase program to increase the amount that management may repurchase to $150 million (less amounts previously repurchased). The Board's authorization does not require the Company to repurchase a specific number of shares and the Board may terminate the repurchase program at any time. Repurchases may be made from time to time in the open market or in privately negotiated transactions. All of the repurchases done by the Company during the secondfirst quarter of 20172018 were in the open market, except 380,637 shares noted below.market. There is no expiration date for the repurchase program.
On June 6, 2017 the Company purchased 380,637 shares of the Company's common stock from an underwriter in conjunction with an underwritten secondary offering by its largest shareholder, Red Mountain Partners, L.P., a fund that is affiliated with Red Mountain Capital Partners, LLC (“Red Mountain”), a related party, for an aggregate purchase price of $8.5 million. The share price of $22.42 was equal to the price per share paid by the underwriter to Red Mountain.
The following table summarizes the Company's repurchases of its common stock during the secondfirst quarter of 2017:2018:
Period Total Number of Shares Purchased Average Price paid Per Share Total Number of Shares Purchased as Part of Publicly Announced Program Maximum Dollar Value of Shares That May Yet Be Purchased Under the Program
April 1, 2017 through April 30, 2017 30,000
 $16.46
 30,000
 $24,128,586
May 1, 2017 through May 31, 2017 30,000
 $23.12
 30,000
 $23,435,088
June 1, 2017 through June 30, 2017 380,637
 $22.42
 380,637
 $14,901,207
Total for the quarter 440,637
 $22.06
 440,637
 $14,901,207
Period Total Number of Shares Purchased Average Price paid Per Share Total Number of Shares Purchased as Part of Publicly Announced Program Maximum Dollar Value of Shares That May Yet Be Purchased Under the Program
January 1, 2018 through January 31, 2018 
 $
 
 $64,901,207
February 1, 2018 through February 28, 2018 
 $
 
 $64,901,207
March 1, 2018 through March 31, 2018 157,000
 $22.80
 157,000
 $61,321,436
Total for the quarter 157,000
 $22.80
 157,000
 $61,321,436


ITEM 5. OTHER INFORMATION
None.

ITEM 6. EXHIBITS
The following exhibits are filed with or incorporated by reference into this report.
Exhibit No.Description of Exhibit
 
10.1First Amendment to the Amended and Restated Credit Agreement, dated asArticles of March 31, 2017, among Cargo Aircraft Management, Inc., as Borrower, Air Transport Services Group, Inc., the Lenders from time to time party hereto, SunTrust Bank, as Administrative Agent, Regions Bank and JPMorgan Chase Bank, N.A., as Syndication Agents and Bank of America, N.A., as Documentation Agent. (1)
10.2Underwriting Agreement, dated May 31, 2017, by and among Air Transport Services Group, Inc., Red Mountain Partners, L.P. and Merrill Lynch, Pierce, Fenner & Smith Incorporated. (2)Incorporation
  
31.1
  
31.2
  
32.1
  
32.2
101.INSXBRL Instance Document
  
101.SCHXBRL Taxonomy Extension Schema Document
  
101.CALXBRL Taxonomy Extension Calculation Linkbase Document
  
101.DEFXBRL Taxonomy Extension Definition Linkbase Document
  
101.LABXBRL Taxonomy Extension Labels Linkbase Document
  
101.PREXBRL Taxonomy Extension Presentation Linkbase Document
____________________
(1)Incorporated by reference to the Company's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 8, 2017.
(2)Incorporated by reference to the Company's Form 8-K filed with the Securities and Exchange Commission on June 2, 2017.


SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this Quarterly report on Form 10-Q to be signed on its behalf by the undersigned, thereunto duly authorized.
    AIR TRANSPORT SERVICES GROUP, INC.,
    a Delaware Corporation
    Registrant
     
    /S/  JOSEPH C. HETE
    Joseph C. Hete
    Chief Executive Officer (Principal Executive Officer)
Date:August 8, 2017May 10, 2018   
     
    /S/  QUINT O. TURNER
    Quint O. Turner
    Chief Financial Officer (Principal Financial Officer
Date:August 8, 2017May 10, 2018  and Principal Accounting Officer)


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