Financing Arrangements
During the six months ended June 30, 2022, we borrowed and repaid $58.0 million under our Credit Facility, and our outstanding obligation under the facility as of June 30, 2022 was $50.0 million. As of June 30, 2022, we had available borrowing capacity of $200.0 million under the initial maximum credit amount of the Credit Facility. As of June 30, 2022, we had $40.0 million available under our accounts receivable securitization program, as reduced for our standby letters of credit issued under the program.
We amended our accounts receivable securitization program in May 2022 to, among other things, increase certain ratios, including the delinquency, default and accounts receivable turnover ratios; add language addressing the potential inclusion of receivables originated by MoLo; and replace LIBOR-based interest pricing conventions with interest pricing based on the Secured Overnight Financing Rate (“SOFR”). The facility ratios were adjusted to accommodate revenue growth and customer demand for integrated logistics solutions. Delivering these services, which was accelerated by the November 2021 acquisition of MoLo, has resulted in an increased proportion of total revenues generated by our Asset-Light operations and, as a result, longer collection periods on our accounts receivable, as are typical for Asset-Light businesses.
We have financed the purchase of certain revenue equipment, other equipment, and software through promissory note arrangements. During the six months ended June 30, 2022, we entered into notes payable arrangements, primarily for revenue equipment, totaling $26.8 million. Future payments due under our notes payable totaled $183.4 million, including interest, as of June 30, 2022, for an increase of $0.1 million from December 31, 2021.
Our financing arrangements, the borrowings and repayments under these agreements, and the scheduled maturities of our long-term debt obligations, are disclosed in Note G to our consolidated financial statements included in Part I, Item 1 of this Quarterly Report on Form 10-Q.
Contractual Obligations
We have purchase obligations, consisting of authorizations to purchase and binding agreements with vendors, relating to revenue equipment used in our Asset-Based and Asset-Light operations, other equipment, facility improvements, software, service contracts, and other items for which amounts were not accrued in the consolidated balance sheet as of June 30, 2022. These purchase obligations totaled $164.4 million as of June 30, 2022, with $155.3 million expected to be paid within the next year, provided that vendors complete their commitments to us. As of June 30, 2022, the amount of our purchase obligations has increased $85.6 million from December 31, 2021, primarily related to the purchase of revenue equipment for our Asset-Based segment, real estate projects and technology advancements which are included in our 2022 capital expenditure plan.
ABF Freight System, Inc. and certain other subsidiaries reported in our Asset-Based operating segment contribute to multiemployer health, welfare, and pension plans based generally on the time worked by their contractual employees, as specified in the collective bargaining agreement and other supporting supplemental agreements (see Note H to our consolidated financial statements included in Part I, Item 1 of this Quarterly Report on Form 10-Q).
As of June 30, 2022, contractual obligations for operating lease liabilities, primarily related to our Asset-Based service centers, totaled $222.1 million, including imputed interest, for an increase of $14.0 million from December 31, 2021. The scheduled maturities of our operating lease liabilities as of June 30, 2022 are disclosed in Note F to our consolidated financial statements included in Part I, Item 1 of this Quarterly Report on Form 10-Q. There have been no other material changes in the contractual obligations disclosed in our 2021 Annual Report on Form 10-K during the six months ended June 30, 2022. We have no investments, loans, or any other known contractual arrangements with unconsolidated special-purpose entities, variable interest entities, or financial partnerships and have no outstanding loans with executive officers or directors.
Our total capital expenditures for 2022, including amounts financed, are estimated to be $240 million to $250 million, net of asset sales. Revenue equipment purchases of approximately $115 million, primarily for our Asset-Based operations, comprise the majority of our estimated net capital expenditures for 2022. The remainder of our 2022 expected capital expenditures include investments above historical annual levels in real estate projects, which are estimated to total