PROMISSORY NOTE


$26,396,590                                                      Effective as of
                                                                 April 1, 1997

                  FOR VALUE RECEIVED, the undersigned,  TRITON AVIATION SERVICES
IV LLC, a California limited liability company having its principal office at 55
Green Street, San Francisco,  California 94111 ("Borrower"),  hereby promises to
pay to the  order of  POLARIS  AIRCRAFT  INCOME  FUND IV, a  California  limited
partnership  ("Lender"),  having an office c/o General Electric Capital Aviation
Services,  Inc. at 201 High Ridge Road, Stamford, CT 06925, the principal amount
of TWENTY-SIX MILLION THREE HUNDRED NINETY-SIX  THOUSAND FIVE HUNDRED NINETY AND
00/100 DOLLARS  ($26,396,590)  (hereinafter  referred to as the principal amount
hereof),  together  with  interest  thereon  (computed on the basis of a 360 day
year) on the unpaid balance thereof,  commencing from the effective date hereof.
Interest  shall  accrue  and be  payable  at a rate  equal to the  lesser of the
maximum lawful rate under  applicable law or twelve percent (12%) per annum (the
"Interest  Rate").  All past due  installments of principal and, if permitted by
applicable law, of interest, shall bear interest at a rate equal to the Interest
Rate plus two percent (2%) per annum (the "Default  Interest Rate").  During the
existence  of any Event of Default (as such term is defined in Section 5 of this
Promissory Note), the entire unpaid balance of principal shall, at the option of
the holder hereof,  bear interest at the Default Interest Rate.  Borrower agrees
to pay  Lender  quarterly,  as it  accrues,  interest  on the  principal  amount
hereunder.  Subject to Sections 1.2 and 1.4 hereof, the principal amount hereof,
together  with  interest at the Interest  Rate,  shall be payable as provided in
Schedule A hereto in  twenty-seven  (27)  quarterly  payments of  principal  and
interest  payable on each  March 31,  June 30,  September  30 and  December  31,
beginning June 30, 1997 and one balloon  payment of all remaining  principal and
accrued interest on March 31, 2004. Each payment of principal and interest shall
be made by wire transfer to a bank account  designated by the holder to Borrower
in writing.

                  The further terms and conditions of this  Promissory  Note are
as follows:



















1.0      Seller Financing; Defined Terms.

                  1.1.  Borrower  and  Lender  have  entered  into that  certain
Purchase,  Assignment and Assumption Agreement (the "Purchase  Agreement") dated
as of April 1,  1997.  This  Promissory  Note is given  in  respect  of  certain
obligations  as more fully set forth in  Section 6 hereof,  in  connection  with
Borrower's acquisition of the Transferred Interests.

                  1.2.  The  principal  amount of this  Promissory  Note and the
principal repayments set forth on Schedule A shall be recalculated in accordance
with Section 1.4 hereof to give effect to any  reduction  to the Purchase  Price
pursuant to Section 4(c) or Section 4(d)(ii) of the Purchase Agreement.

                  1.3.  This Promissory  Note may be prepaid in whole or in part
at any time without penalty.

                  1.4.  Amounts  prepaid  pursuant to Sections 1.3 or 3.8 hereof
shall be  applied  on a pro rata  basis to  reduce  all  remaining  payments  of
principal and the interest  payable thereon shall be recalculated  based on such
reduced  outstanding  principal  amount  in  accordance  with a  mortgage  style
amortization  schedule  determined  with reference to the remaining term of this
Promissory Note plus four quarters with a balloon payment due at March 31, 2004.

                  1.5. Unless  otherwise  defined  herein,  terms defined in the
Purchase  Agreement are used herein as therein defined,  and the following shall
have (unless otherwise provided elsewhere in this Promissory Note) the following
respective meanings (such meanings being equally applicable to both the singular
and plural form of the terms defined):

                  "Economic Interest" means with respect to a member of Borrower
(i) if such  member's  capital  account is a  positive  amount,  the  percentage
obtained by dividing such member's capital account by the total positive capital
accounts of all members of Borrower,  (ii) if such member's  capital  account is
zero or less, a percentage  equal to zero,  or (iii) if the capital  accounts of
all  members  are  zero or less,  the  percentage  interest  of such  member  in
distributions  of  Borrower's  cash flow from  operations.  The capital  account
amounts  set forth in the most  recently  filed  Federal  income  tax  return of
Borrower  and the  cash  flow  percentages  set  forth in  Borrower's  operating
agreement shall be used for the foregoing determination.





                                        2











                  "Equity  Dividend  Amount"  means,  (i) for any calendar month
that  ends  prior to the  first  Effective  Time to  occur  under  the  Purchase
Agreement,  an amount equal to $41,709, and (ii) for the calendar month in which
the first  Effective  Time  occurs  under the  Purchase  Agreement  and for each
calendar month thereafter, an amount equal to $69,516 and for any period that is
less than a calendar month, a proportionate  amount thereof calculated using the
same proportion that the number of days in such period bears to thirty days.

                  "Indebtedness"  of any Person means any (i)  indebtedness  for
borrowed  money or for the deferred  purchase price of property or services (but
not including  obligations to trade creditors incurred in the ordinary course of
business that are not yet due and payable), (ii) obligations evidenced by notes,
bonds, debentures or similar instruments,  (iii) indebtedness created or arising
under any conditional  sale or other title  retention  agreement with respect to
acquired  property,  (iv)  capitalized  lease  obligations  of such Person,  (v)
obligations  guaranteeing,  indemnifying,  assuming,  purchasing or repaying any
indebtedness,  lease,  dividend,  or other obligation of any other Person in any
manner,  (vi)  indebtedness  referred to in clause (i), (ii), (iii), (iv) or (v)
above secured by (or for which the holder of such  indebtedness  has an existing
right,  contingent or otherwise,  to be secured by) any Lien upon or in property
owned by such Person, or (vii) liabilities under Title IV of ERISA (as such term
is defined in Section 2.11).

                  "Letter of Credit" means an irrevocable  direct-pay  letter of
credit issued by a bank (i) whose long term debt  obligations  are rated "AA" or
better by Thompson's  Bankwatch or (ii) that is rated "AA" or better by Standard
& Poor's in the Financial  Institutions  Rating Service and that is payable upon
presentation  by the  beneficiary  of such Letter of Credit of a sight draft (it
being understood,  but without any impairment of the issuing bank's  obligations
under such Letter of Credit,  that the beneficiary  shall not present such sight
draft unless (x) there has been a default under the  promissory  note secured by
such Letter of Credit or (y) the Letter of Credit would expire within 45 days of
such  presentation  and an extension of such expiration date shall not have been
granted nor an acceptable replacement Letter of Credit been provided).

                  "Permitted  Investment" means (i) any Permitted SPV Investment
and (ii) (A) any evidence of Indebtedness, maturing not more than one year after
its acquisition by Borrower, issued or unconditionally  guaranteed by the United
States  Government,  (B) commercial paper,  maturing not more than twelve months
from the date of issue,  which is  issued by a Person  having a rating of A-1 or
P-1 or the  equivalent or higher from at least one of Standard & Poor's  Ratings
Services,  Moody's  Investors  Service,  Inc.,  Phoenix  Duff & Phelps  or Fitch






                                                   3











Investors  Services,  (C) any  certificate  of deposit  or  bankers  acceptance,
maturing  not more than one year after its  acquisition  by  Borrower,  which is
issued  by a  commercial  banking  institution  organized  under the laws of the
United States that has a combined  capital and surplus and undivided  profits of
not less than $250,000,000,  (D) any repurchase  agreement entered into with any
commercial  banking  institution  described in the foregoing clause (C) which is
secured by a security  interest in any  obligation of a type described in any of
the  foregoing  clauses (A)  through  (C),  or (E) any money  market  account or
similar  investment  account  that  invests  solely  in  securities  of the type
described in clause (A), (B) or (C) of this definition.

                  "Permitted  SPV   Indebtedness"   means  any  indebtedness  of
Borrower:  (i) owed to any Triton LLC, (ii) for monies  borrowed  solely for the
purpose of (x) funding any maintenance,  improvements, additions, refurbishments
or modifications to any Aircraft owned,  directly or indirectly,  by Borrower or
(y) making  payments due and owing to Lender under this Promissory  Note,  (iii)
evidenced by a note payable to such Triton LLC on demand,  bearing interest at a
rate equal to the higher of 12% per annum or Bank of  America's  prime rate plus
2%, but not  exceeding  the maximum  lawful rate under  applicable  law and (iv)
guaranteed  by TIL and  secured by a Letter of Credit in an amount  equal to the
outstanding  balance of such promissory  note plus six months  interest  thereon
(calculated at 10% per annum), all as provided in the Loan Guaranty.

                  "Permitted  SPV  Investment"  means a demand loan made: (i) to
any Triton LLC,  (ii)  solely for the  purpose of (a)  funding any  maintenance,
improvements,  additions, refurbishments or modifications to any Aircraft owned,
directly or indirectly,  by such Triton LLC or (b) making payments due and owing
to a Polaris  Entity by such Triton LLC under a promissory  note entered into in
connection with an SPV Purchase Agreement,  (iii) evidenced by a promissory note
made by such Triton LLC payable to Borrower on Borrower's  demand,  (iv) bearing
interest  at a rate  equal to the  higher of 10% per annum or Bank of  America's
prime rate plus 2%, but not exceeding the maximum  lawful rate under  applicable
law and (v)  guaranteed by TIL and secured by a Letter of Credit issued in favor
of Borrower in an amount  equal to the  outstanding  balance of such  promissory
note plus six months interest thereon (calculated at 10% per annum).

                  "Polaris Entity" means any of Polaris Aircraft Income Fund II,
Polaris  Aircraft  Income Fund III,  Polaris  Aircraft  Income Fund IV,  Polaris
Aircraft  Income Fund V or Polaris  Aircraft  Income Fund VI, each a  California
limited partnership.

                  "Qualified   Holder"  means  (i)  any  Person  who  is  Triton
Management,  (ii) any Triton Member or (iii) any Person with a consolidated  net
worth,  net of  minority  interests  and,  if such  Person is a natural  person,






                                        4











exclusive  of his  principal  residence,  of an amount that is not less than the
greater of (x)  $3,000,000  or (y) the  product of the  aggregate  consideration
(including cash, notes or other deferred  compensation)  paid by such Person for
all ownership interests owned by such Person in Borrower multiplied by two.

                  "SPV  Purchase   Agreements"  means  those  certain  Purchase,
Assignment and Assumption  Agreements,  each by and between a Polaris Entity, as
assignor,  and a Triton LLC, as assignee,  entered into  simultaneously with the
Purchase Agreement.

                  "TAL" means Triton Aviation Limited, a Bermuda corporation.

                  "TASL"  means  Triton  Aviation  Services  Limited,  a Bermuda
corporation.

                  "TIL" means Triton Investment Limited, a Bermuda corporation.

                  "Triton   Container"  means  Triton  Container   International
Limited, a Bermuda corporation.

                  "Triton  LLC" means any of Triton  Aviation  Services  II LLC,
Triton  Aviation  Services III LLC,  Triton  Aviation  Services IV LLC or Triton
Aviation Services V LLC, each a California limited liability company.

                  "Triton  Management"  means  any  director,  officer  or other
member of senior management of TASL, or TIL or any Triton Member.

                  "Triton  Member" means (i) TAL, TASL and Triton  Container and
(ii) any other  Person 90% or more of the  ownership  interest in which is held,
directly or indirectly,  by TIL and which Person has a  consolidated  net worth,
net of minority  interests,  that is not less than the greater of (x) $3,000,000
or (y) the product of the  aggregate  consideration  (including  cash,  notes or
other  deferred  compensation)  paid by such Person for all ownership  interests
owned by such Person in Borrower multiplied by two.

         2.0  Representations  and  Warranties.  To induce Lender to accept this
Note and  extend  seller  financing  to  Borrower,  Borrower  hereby  makes  the
following representations and warranties:

                  2.1.  Borrower is a limited  liability company duly organized,
validly  existing and in good standing under the laws of the State of California
and is  duly  qualified  as a  foreign  limited  liability  company  and in good
standing under the laws of each





                                        5











jurisdiction  where its  ownership  or lease of  property  or the conduct of its
business requires such qualification  (except for jurisdictions in which failure
to so qualify or be in good standing would not have a material adverse effect on
the business, assets, operations,  prospects, or financial or other condition of
Borrower (a "Material Adverse Effect")).

                  2.2. The  execution,  delivery and  performance by Borrower of
this Promissory Note are within  Borrower's  power, have been duly authorized by
all  necessary  or  proper  limited  liability   company  action,   are  not  in
contravention of any provision of Borrower's articles of organization, operating
agreement,  or any other such  governing  document,  will not violate any law or
regulation,  or any order or decree of any Government Entity,  will not conflict
with or result in the breach or  termination  of,  constitute a default under or
accelerate any performance required by, any indenture,  mortgage, deed of trust,
lease,  agreement,  or other instrument to which Borrower is a party or by which
Borrower or its property is bound, and do not require the consent or approval of
any Person except those already  obtained.  This Promissory Note constitutes the
legal,  valid and  binding  obligation  of  Borrower  enforceable  against it in
accordance  with its terms,  subject to the  effect of  bankruptcy,  insolvency,
reorganization,  receivership,  moratorium  and other similar laws affecting the
rights  and  remedies  of  creditors   generally   and,   with  respect  to  the
enforceability  of this  Promissory  Note,  by  general  principles  of  equity,
including principles of commercial  reasonableness,  good faith and fair dealing
(regardless  of  whether  enforcement  is  sought in a  proceeding  at law or in
equity).

                  2.3.  The pro forma  balance  sheet of  Borrower  as of May 1,
1997, a copy of which has been  furnished to Lender,  was prepared in accordance
with  generally  accepted  accounting   principles  ("GAAP")  and  reflects  the
assignment of all Transferred  Interests and the seller  financing  transactions
contemplated  hereunder and under the Purchase Agreement as if they had occurred
as at the date of such balance  sheet and  presents  fairly on a pro forma basis
the financial position of Borrower at such date assuming the events specified in
this paragraph had actually occurred on such date.  Borrower,  as of the date of
this Promissory Note, had no obligations,  contingent liabilities or liabilities
for taxes or other  charges,  long-term  leases or unusual  forward or long-term
commitments  which were not  reflected in the  aforementioned  pro forma balance
sheet of Borrower.

                  2.4. No dividends or other  distributions  have been declared,
paid or made upon any  membership  interest  (or any other  equity  interest) of
Borrower nor have any  membership  interests  (or any other equity  interest) of
Borrower been redeemed,  retired,  purchased or otherwise  acquired for value by
Borrower.






                                        6











                  2.5. Borrower owns full, complete and good title to all of its
properties  and assets and none of its  properties  and assets is subject to any
mortgage  or  deed  of  trust,  pledge,   hypothecation,   assignment,   deposit
arrangement, lien, charge, claim, security interest, easement or encumbrance, or
other security agreement of any kind or nature whatsoever (collectively, "Liens"
and  individually,  a "Lien"),  except  Permitted  Encumbrances  (as  defined in
Section 4.3 hereof).

                  2.6.  Borrower has insurance on all its  properties or assets,
including,  without  limitation,  policies of fire, theft and other casualty and
liability  insurance on terms and  conditions  and in amounts that are customary
for  owners of  commercial  aircraft.  All such  policies  are in full force and
effect and there are no defaults by any party under any provision thereof.

                  2.7.  Borrower  is not in  default,  nor is any third party in
default,  under  or with  respect  to any  contract,  agreement,  lease or other
instrument to which Borrower is a party.

                  2.8. Borrower is not an "investment company" or an "affiliated
person"  of, or  "promoter"  or  "principal  underwriter"  for,  an  "investment
company," as such terms are defined in the  Investment  Company Act of 1940,  as
amended.  The  obligations  evidenced by this  Promissory  Note,  the  repayment
thereof and the consummation of the transactions contemplated by this Promissory
Note will not violate any provision of such Act or any rule, regulation or order
issued by the Securities and Exchange Commission thereunder.

                  2.9. The seller  financing  evidenced by this  Promissory Note
will be used only for the purposes contemplated hereunder and under the Purchase
Agreement.

                  2.10.  All  federal,  state,  local and foreign  tax  returns,
reports and statements required to be filed by Borrower have been filed with the
appropriate  governmental  agencies and all taxes, charges and other impositions
shown  thereon to be due and  payable  have been paid prior to the date on which
any fine,  penalty,  interest or late charge may be added thereto for nonpayment
thereof,  or any such  fine,  penalty,  interest  or late  charge has been paid.
Borrower has paid when due and payable all taxes and other  charges  required to
be paid by it except those  contested in good faith by appropriate  proceedings,
with  adequate  reserves made in respect  thereof in accordance  with and to the
extent required by GAAP.






                                        7











                  2.11.  Borrower  does not maintain or contribute to and is not
obligated to contribute to, and has not maintained or contributed to and was not
obligated to contribute to, any employee benefit plan as defined in Section 3(3)
of the Employee Retirement Income Security Act of 1974, as amended ("ERISA").

                  2.12.  No  action,  claim  or  proceeding  is now  pending  or
threatened against Borrower,  at law, in equity or otherwise,  before any court,
board,  commission,  agency or instrumentality  of any federal,  state, or local
government or of any agency or subdivision  thereof, or before any arbitrator or
panel of arbitrators nor does a state of facts exist which is reasonably  likely
to give rise to such proceedings.

                  2.13.  All representations  and warranties made by Borrower in
the Purchase  Agreement are true and correct in all material  respects on and as
of the date hereof as though made on and as of this date.

         3.0  Affirmative Covenants.  Borrower covenants and agrees that, unless
Lender shall  otherwise  consent in writing,  from and after the date hereof and
until this Promissory Note is paid in full:

                  3.1.  Borrower  shall  (i) do or cause  to be done all  things
necessary  to  preserve  and keep in full force and effect  its  existence  as a
California  limited liability  company and its rights;  (ii) continue to conduct
its  business  in  accordance  with its  operating  agreement  and  articles  of
organization as permitted hereunder; and (iii) at all times use its best efforts
to maintain,  preserve and protect,  or cause to be  maintained,  preserved  and
protected,  all of its property, in use or useful in the conduct of its business
and keep the same in good  repair,  working  order and  condition  (taking  into
consideration ordinary wear and tear).

                  3.2.  Borrower shall (i) pay and discharge or cause to be paid
and discharged all its Indebtedness,  including, without limitation, all amounts
outstanding  hereunder  as and  when due and  payable,  and  (ii)  except  where
contested,  in good faith, by proper legal actions or proceedings  with adequate
cash reserves  therefor,  pay and  discharge or cause to be paid and  discharged
promptly all (A) taxes or other charges imposed upon it, its income and profits,
or any of its real or personal property, whether tangible or intangible, and (B)
lawful claims for labor,  materials,  supplies and services or otherwise  before
any thereof shall become in default.

                  3.3. Borrower shall deliver to Lender (i) within 60 days after
the end of each of the first three fiscal  quarters of  Borrower,  a copy of the
unaudited balance sheet





                                        8











of Borrower as of the end of such fiscal  quarter and an unaudited  statement of
income and cash flow of  Borrower  for such  fiscal  quarter,  all  prepared  in
accordance with GAAP (subject to normal year end  adjustment),  accompanied by a
certification of the chief executive  officer or chief financial  officer of the
manager of Borrower that all such financial  statements are complete and correct
and present  fairly,  all in  accordance  with GAAP  (subject to normal year end
adjustments),  the financial  position,  the results of operations and cash flow
statements  of  Borrower  as at the end of such  quarter and for the period then
ended and that no Event of Default  or event  which with the giving of notice or
lapse of time or both  would  become an Event of  Default  (a  "Default")  is in
existence  as of such time,  (ii)  within 120 days after the end of each  fiscal
year of Borrower,  a copy of the audited balance sheet of Borrower as of the end
of such fiscal year and an audited statement of income and cash flow of Borrower
for such fiscal year, all prepared in accordance with GAAP, accompanied by (x) a
certification  of the chief  executive  officer  or chief  financial  officer of
Borrower that all such financial statements are complete and correct and present
fairly,  all in accordance  with GAAP,  the financial  position,  the results of
operations  and the changes in  financial  position of Borrower as at the end of
such year and for the period  then ended and that no Default or Event of Default
is in existence as of such time and (y) an auditor's  report  unqualified  as to
the scope of the audit and as to the Borrower being a going  concern,  from KPMG
Peat Marwick LLP, or any other firm of independent  certified public accountants
of recognized  national  standing selected by Borrower and acceptable to Lender,
(iii)  copies of any  documents  relating to or  evidencing  any  Permitted  SPV
Indebtedness  incurred by or any Permitted SPV Investment  made by Borrower,  no
later than  three (3)  business  days after  Borrower  incurring  or making,  as
applicable,  any Permitted SPV  Indebtedness or Permitted SPV  Investment,  (iv)
notice that the Borrower has  incurred  any other  Indebtedness  or acquired any
Permitted  Investments  (other than Permitted SPV  Investments) no later than 30
days after Borrower incurring or making, as applicable, any such Indebtedness or
Permitted Investment together with such other information about any Indebtedness
or Permitted  Investment as Lender may reasonably request, (v) written notice of
any Keep Well proceeds  received by Borrower and of any dividend or distribution
declared or made by Borrower, in each case no later than three (3) business days
after  receipt  of such  proceeds  or the  declaration  or  payment  of any such
dividend  or  distribution,  as  applicable  and  (vi)  written  notice  of  any
transaction  by Borrower  with an Affiliate  setting  forth the identity of each
Affiliate  that is a party  to such  transaction,  the  material  terms  of such
transaction and any amounts  required to be paid by, on behalf of or to Borrower
in respect of such transaction.

                  3.4.  Borrower shall deliver to Lender as soon as practicable,
but in any event within two (2) business  days after  Borrower  becomes aware of
the existence of any Default or Event of Default,  or any  development  or other






                                        9











information which would have a Material Adverse Effect,  telephonic or facsimile
notice specifying the nature of such Default, Event of Default or development or
information,   including  the  anticipated  effect  thereof,  which  notice,  if
telephonic,  shall be promptly  confirmed in writing to Lender  within three (3)
business days.

                  3.5.  Borrower shall deliver to Lender such other  information
respecting Borrower's business,  financial condition or prospects as Lender may,
from time to time,  reasonably request including,  without  limitation,  monthly
reports  of the  outstanding  balances  of  accounts  receivable  since the last
monthly  report;  a detailed  aged trial balance of all  then-existing  accounts
receivable by Lessee and specifying the names of account  debtors and such other
information  relating  to the  accounts  receivable  as  Lender  may  reasonably
require;  and a certificate  of the gross revenues of Borrower for the preceding
month.  Lender and any of its officers,  employees  and/or agents shall have the
right,   exercisable  as  frequently  as  Lender  reasonably  determines  to  be
appropriate,  during  normal  business  hours  (or at such  other  times  as may
reasonably be requested by Lender),  to inspect the properties and facilities of
Borrower and to inspect, audit and make extracts from all of Borrower's records,
files and books of account.  Borrower  shall  deliver any document or instrument
reasonably  necessary  for  Lender to obtain  records  from any  service  bureau
maintaining records for Borrower.

                  3.6.  (a)  Borrower  shall,  either  directly  or  indirectly,
procure and maintain insurance policies with reputable insurers, covering all of
its properties or assets, including, without limitation, policies of fire, theft
and other  casualty  and  liability  insurance on terms and  conditions  and for
amounts that are customary for owners of commercial  aircraft.  Without limiting
the foregoing, Borrower shall, directly or indirectly,  procure and maintain, at
all times,  (i) all risk hull  insurance  (including  the War and Allied  Perils
Endorsement  insurance) written by recognized aircraft insurers on each Aircraft
owned, directly or indirectly,  by Borrower in an amount equal, at all times, to
the Appraised Value of such Aircraft and (ii) comprehensive  liability insurance
written in an amount  not less than  $500,000,000.  Lender  shall be named as an
additional  insured  on all such  insurance  policies  and  named as  additional
insured on all liability policies.

                  (b) All such policies of insurance  shall provide (i) by means
of endorsements or otherwise,  in form and manner  satisfactory to Lender,  that
such  insurance  shall not be  invalidated by any action or inaction of Borrower
and shall insure Lender,  regardless of any breach or violation of any warranty,
declaration or condition  contained in such policies by Borrower;  (ii) by means
of endorsements or otherwise in form and manner  satisfactory to Lender, that if
such insurance is cancelled for any reason whatever,  or any substantial  change
is made in the coverage which affects the interests of Lender or





                                       10











if  such  insurance  is  allowed  to  lapse  for  nonpayment  of  premium,  such
cancellation,  change or lapse shall not be  effective  as to Lender for 30 days
(or, in the case of any war risks or allied perils coverage,  seven (7) days, or
such  other  period as may from time to time be  customarily  obtainable  in the
industry)  after receipt by Lender of written  notice from such insurers of such
cancellation,  change or lapse;  (iii) by means of  endorsements or otherwise in
form and manner  satisfactory  to Lender,  that such  insurers  shall  waive any
rights of subrogation  against Lender;  (iv) that they are primary without right
of contribution from any other insurance which is carried by Lender with respect
to any  Aircraft  that is owned,  directly or  indirectly,  by Borrower  (or any
engines or other parts thereof); and (v) that all provisions thereof, except the
limits  of  liability,  shall  operate  in the same  manner  as if there  were a
separate policy with and covering each insured.

                  (c) Borrower shall arrange for appropriate  certification,  to
the  reasonable  satisfaction  of Lender,  as to the scope and existence of such
insurance  and the  terms  thereof  to be  made to  Lender  on or  prior  to the
occurrence of the first Effective Time under the Purchase Agreement and annually
thereafter, until this Promissory Note is paid in full, and thereafter not later
than fourteen (14) days after the renewal date of each of the insurances by each
insurer (or by a firm of independent  insurance brokers of reorganized  standing
in the placement of similar coverage) in such form and dealing with such matters
relating to the  obligations  of  Borrower  hereunder  as Lender may  reasonably
require.

                  3.7.  Borrower shall comply with all Federal,  state and local
laws and regulations  applicable to it,  including,  without  limitation,  those
relating to environmental matters and perform, within all required time periods,
all of its  obligations  and enforce all of its rights  under each  agreement to
which it is a party.  Borrower  shall not  terminate  or  modify  in any  manner
materially  adverse to Borrower any  provision of any agreement to which it is a
party.

                  3.8. (a) Borrower  shall make a prepayment on this  Promissory
Note on the terms  hereinafter  set  forth in the event of any sale or  casualty
loss (each a  "Prepayment  Event")  relating  to any  Aircraft  or any  property
comprising all or any portion of any Transferred  Interest  acquired by Borrower
pursuant to the Purchase  Agreement  (an  "Asset")  (each such Asset that is the
subject of a Prepayment Event is hereinafter  referred to as a "Removed Asset");
provided,  however,  a  Prepayment  Event shall not be deemed to include (i) any
sale of an engine or a part if,  within 45 days (with  respect to engines) or 90
days (with respect to parts) after such sale, Borrower obtains a replacement for
such  engine or part that has the same or  greater  value as the  engine or part
that was the subject of such sale,  (ii) any sale of obsolete or surplus  parts,
at their fair market value, to the





                                       11











extent  that the  aggregate  of all such sales in a calendar  year do not exceed
$200,000 or (iii) any casualty loss of an engine or any part if Borrower  causes
such engine or part to be repaired or replaced,  within 45 days (with respect to
engines) or 90 days (with respect to parts) after such casualty  loss,  and such
repaired or replaced  engine or part has the same or greater value as the engine
or part that was the  subject  of such  casualty  loss.  If a  Prepayment  Event
relates to a Removed  Asset but relates to less than the entire  Removed  Asset,
Borrower and Lender shall  negotiate in good faith to determine the  appropriate
percentage of such Removed Asset that was the subject of such Prepayment  Event.
Such  percentage  shall then be multiplied by the appraised  value of the entire
Removed Asset (calculated  immediately prior to the Prepayment  Event),  and the
amount therefrom shall be used to calculate the Allocable Portion Percentage (as
defined below) of the Removed Asset.

                  (b) The  amount of the  prepayment  required  as a result of a
Prepayment  Event  shall be an amount  equal to the  greater  of (1) 100% of the
Allocable  Portion  Percentage  for the  Removed  Asset  multiplied  by the then
outstanding  principal  balance  of this  Promissory  Note and (2) the  proceeds
actually  received  by  Borrower  in respect of the  Removed  Asset,  net of any
reasonable  out of pocket costs and expenses  incurred by Borrower in connection
with such  Prepayment  Event  (but not to exceed an amount  equal to 120% of the
Allocable Portion Percentage with respect to the Removed Asset multiplied by the
then  outstanding  principal  balance of this  Promissory  Note).  The Allocable
Portion Percentage shall mean, with respect to any Asset, the amount obtained by
dividing the appraised  value of the Asset  immediately  prior to the Prepayment
Event by the sum of the  appraised  values  of all  Assets  owned,  directly  or
indirectly,  by Borrower  immediately  prior to the Prepayment  Event.  For this
purpose,  appraised  value of an  Aircraft  owned,  directly or  indirectly,  by
Borrower  shall be the Appraised  Value.  The appraised  value of any receivable
that  constitutes a Removed Asset shall be the aggregate  outstanding  amount of
the principal and accrued interest and fees on such receivable as of the date of
the Prepayment Event.

                  (c) Any prepayment  required as a result of a Prepayment Event
shall be due and payable  hereunder  no later than three (3) days after the date
of the Prepayment Event;  provided,  that if such Prepayment Event is a casualty
loss that is insured, the portion of the prepayment required as a result of such
Prepayment  Event that is payable  pursuant to such insurance  coverage shall be
due and payable hereunder no later than the first to occur of (i) three (3) days
after receipt by Borrower of such  insurance  coverage or (ii) 15 days after the
date of the Prepayment Event. Amounts prepaid pursuant to this Section 3.8 shall
be applied as provided in Section 1.4 hereof.






                                       12











         4.0 Negative  Covenants.  Borrower  covenants and agrees that,  without
Lender's  prior written  consent,  from and after the date hereof and until this
Promissory Note is paid in full:

                  4.1. Borrower shall not, directly or indirectly,  by operation
of law or otherwise,  merge with, consolidate with, acquire all or substantially
all of the assets or capital  stock or other equity  interests  in, or otherwise
combine with, any Person (excluding the acquisition of the Transferred Interests
pursuant to the Purchase Agreement), nor form any subsidiary.

                  4.2.  (a)  Except as  otherwise  expressly  permitted  by this
Promissory Note, Borrower shall not create, incur, assume or permit to exist any
Indebtedness  except (i)  Indebtedness  evidenced by this Promissory  Note, (ii)
Permitted SPV Indebtedness,  (iii)  Indebtedness to trade creditors  incurred in
the ordinary  course of business that is due and payable but is being  contested
in good faith,  by proper  legal  actions or  proceedings,  if Borrower has cash
reserves on hand adequate to pay such Indebtedness, (iv) deferred taxes that are
either not yet due and  payable or are being  contested  in good faith by proper
legal actions or proceedings,  if Borrower has cash reserves on hand adequate to
pay such deferred taxes, and (v) Indebtedness, not to exceed $25,000,000, in the
aggregate,  during the term of this  Promissory  Note that is incurred  and used
solely to hushkit an Aircraft that is owned, directly or indirectly, by Borrower
(or to refinance  any  Indebtedness  incurred  solely to hushkit such  Aircraft;
provided,  however, that (x) the amount of such Indebtedness does not exceed the
then outstanding  principal  amount of the Indebtedness  being so refinanced and
(y) the term of such  Indebtedness does not materially extend beyond the term of
the  Indebtedness  being so  refinanced).  Indebtedness  incurred by Borrower to
hushkit an  Aircraft  that is owned,  directly  or  indirectly,  by it shall not
exceed the aggregate fair market value of such hushkit equipment and labor costs
necessary to install such hushkit equipment on such Aircraft.

                             (b) Borrower shall not make investments in, or make
or accrue loans or advances of money  through the direct or indirect  holding of
securities or otherwise to any Person; provided,  however, that Borrower may own
the  Transferred  Interests  and may invest in Permitted  Investments.  Borrower
shall demand  payment  under any Permitted  SPV  Investment  (or any guaranty or
Letter of Credit  guaranteeing or securing such Permitted SPV Investment) to the
extent  Borrower  needs  funds to make any  payments  due to Lender  under  this
Promissory Note.

                  4.3.  Borrower  shall not  create or permit any Lien on any of
its properties or assets except any of the following ("Permitted Encumbrances"):






                                       13











(A) Liens for taxes or assessments or other governmental  charges or levies, not
yet due and  payable,  (B) Liens in favor of such Owner  Trustee  pursuant  to a
Trust Agreement or, in each case, workers', mechanics',  suppliers',  carriers',
warehousemen's or other similar Liens arising in the ordinary course of business
and  securing  obligations  that are not yet due and  payable,  (C)  Liens on an
Aircraft  securing  Indebtedness  of Borrower which is permitted by the terms of
this  Promissory  Note and which is incurred  solely to hushkit such Aircraft (a
"Current  Loan");  provided,  however,  that if such Current Loan constitutes an
extension  of credit  pursuant to an existing  financing  facility of  Borrower,
Borrower  may grant,  to secure such  Current  Loan, a Lien on one or more other
Aircraft  if each such  other  Aircraft  is at such time  subject to a Lien that
secures such existing financing facility,  (D) any renewal or replacement of any
Lien permitted by (C) above (in  connection  with  refinancing  of  Indebtedness
permitted by  subsection  4.2(a)(v)  hereof);  provided,  however,  that (x) the
amount of Indebtedness  secured by any such renewal or replacement Lien does not
exceed  the then  outstanding  principal  amount  of the  Indebtedness  being so
refinanced,  (y) such renewal or  replacement  Lien does not spread to cover any
additional  asset  and (z) the  term of the  Indebtedness  secured  by any  such
replacement Lien does not materially  extend beyond the term of the Indebtedness
being so refinanced; (E) leases of the Aircraft and (F) Liens on Aircraft owned,
directly or  indirectly,  by  Borrower of a type that a lessee of such  Aircraft
would  customarily  be  permitted  to incur and be  required to remove from such
Aircraft.

                  4.4.  Borrower  shall  not  issue  or sell or  enter  into any
agreement,  contract or commitment to issue or sell any equity  interest  (other
than those  outstanding as of the date of this Agreement)  unless,  after giving
effect to such  issuance  or sale (a) TASL  shall  remain  the sole  manager  of
Borrower, retaining all responsibilities and duties allocated to TASL as manager
of  Borrower  pursuant to  Borrower's  operating  agreement  or  certificate  of
formation  and shall make no delegation or assignment to any other Person of any
such  responsibility  or duty  except as  permitted  thereby,  (b) the number of
members of Borrower (x) who are not Triton  Members or Triton  Management  shall
not exceed three (3) (y) who are Triton Management shall not exceed five (5) and
(z) who are Triton Members  (excluding TAL, TASL and Triton Container) shall not
exceed five (5), (c) the Triton Members shall hold, in the  aggregate,  at least
50% of the  Economic  Interests  of  Borrower,  (d) the  holder  of such  equity
interest shall be a Qualified Holder,  (e) such Qualified Holder shall expressly
agree to the pledge of such  Interests  under the Security  Agreement  and to be
bound by the terms and conditions thereof,  and (f) after notice to Lender given
pursuant  to the terms of  Section  10  hereof,  Lender  shall  consent  to such
transfer or issuance (such consent not to be unreasonably  withheld);  provided,
however,  that if Lender does not  respond to such  notice  within ten (10) days
after receipt by Lender of such notice,  such consent  shall be deemed  granted.






                                       14











Notwithstanding  the  foregoing,  no such  issuance  or sale shall be made if it
would  violate  any  applicable  law or cause the  Aircraft  owned,  directly or
indirectly,  by Borrower then registered  under the Act no longer to be eligible
for registration under the Act.

                  4.5.  Borrower  shall not (i) make any  changes in its capital
structure  (including,  without  limitation,  in the  terms  of its  outstanding
membership interests,  stock or any other equity interests,  as the case may be)
except as permitted by Section 4.4 or (ii) amend its operating  agreement or any
other  such  governing  document  (other  than  amendments  (1) with  respect to
allocations of (A) profits and losses,  (B) tax income or gains or tax losses or
any  components  thereof  or (C)  cash  distributions  among  members  or (2) to
implement  actions  permitted under this  Promissory  Note,  provided,  however,
notice of amendments to implement such actions shall be given to Lender no later
than ten (10) days prior to their effectiveness).

                  4.6.  Borrower  shall not engage in any business or activities
except to the  extent  permitted  by  Borrower's  articles  of  organization  or
operating agreement.

                  4.7.   Except  as  otherwise   expressly   permitted  by  this
Promissory  Note,  Borrower  shall not (i) pay or enter  into any  agreement  or
transaction  to  pay  to  any  of  its  Affiliates  any  management,   advisory,
consulting,  service or similar fee or any fee based on or related to Borrower's
operating  performance or income or any percentage  thereof;  or (ii) enter into
any other  transaction  with any of its Affiliates,  except (A) any agreement or
transaction  entered into pursuant to the reasonable  requirements of Borrower's
ordinary  course  of  business  and upon  terms  that are no less  favorable  to
Borrower than  Borrower  could obtain in a comparable  arm's length  transaction
with a Person not an Affiliate of Borrower and (B) reimbursement to TASL for the
costs  and  expenses  incurred  by  TASL  in  connection  with  the  repair  and
refurbishment  of the aircraft bearing  manufacturer's  serial numbers 19711 and
20236.  Borrower shall not enter into or be a party to any transaction  with any
Person  except  for  transactions  entered  into  upon  arm's  length  terms and
conditions that are commercially reasonable and fair to Borrower. Borrower shall
not enter into any employment agreements or pay any management or similar fee to
any Person or become  obligated to pay any Person any  advisory,  consulting  or
service  fee  except  in  accordance  with the  reasonable  needs of  Borrower's
business  and  operations.  Borrower  shall not amend or agree to amend the Keep
Well, the Keep Well Guaranty or the Loan Guaranty.

                  4.8. Borrower shall not make capital  expenditures  during the
term of this Promissory Note,  except for capital  expenditures made to fund any
maintenance,  improvements,  additions,  refurbishments  or modifications to any
Aircraft owned, directly or indirectly, by Borrower.





                                       15













                  4.9.  (a)  Borrower  shall  not  sell,  transfer,   convey  or
otherwise  dispose  of any assets or  properties;  provided,  however,  that the
foregoing  shall not  prohibit  (i)  transfers  resulting  from any  casualty or
condemnation  of assets or  properties or (ii) sales of engines or parts that do
not constitute Prepayment Events pursuant to Section 3.8(a). Notwithstanding the
foregoing,  Borrower may, subject to Section 3.8 hereof, sell Assets without the
consent of the holder of this Promissory Note if the proceeds from any such sale
(net of any costs and  expenses  or other  obligations  incurred  by Borrower in
connection  with  such  sale)  equal or  exceed  100% of the  Allocable  Portion
Percentage  for such Asset  multiplied by the then  outstanding  balance of this
Promissory Note.

                        (b)  Borrower  shall  not  sell,  transfer,   convey  or
otherwise  dispose of all or any  portion of any Asset for an amount (net of any
costs,  expenses or other  obligations  incurred by Borrower in connection  with
such sale, transfer,  conveyance or disposition) less than 100% of the Allocable
Portion  Percentage of such Asset multiplied by the then outstanding  balance of
this  Promissory  Note without the prior  written  consent of the holder of this
Promissory  Note  unless  Borrower  has  sufficient  funds  available  from  (a)
operating cash flow,  exclusive of security  deposits,  maintenance  reserves or
other  property  held by it as  collateral,  (b) the  issuance or sale of equity
interests  in  Borrower,  (c)  sale  proceeds  held by it from the sale of other
Aircraft owned, directly or indirectly by it, (d) funds paid to Borrower by TASL
under  the Keep  Well if the  Asset is  disposed  of for an  amount  equal to or
greater than the product of (1) 90% of the Allocable Portion Percentage for such
Asset multiplied by (2) the then outstanding balance of this Promissory Note, or
(e) any combination of the foregoing, which funds, when added to the proceeds of
the  disposition  of  such  Asset  (net  of any  costs  and  expenses  or  other
obligations  incurred  by  Borrower  in  connection  with such  sale,  transfer,
conveyance or  disposition)  will equal the product of (A) 100% of the Allocable
Portion Percentage of such Asset multiplied by (B) the then outstanding  balance
of this  Promissory  Note. If Borrower  sells,  transfers,  conveys or otherwise
disposes  of  less  than  100%  of  an  Asset,  the  percentage  interest  sold,
transferred,  conveyed  or  otherwise  disposed  of shall be  multiplied  by the
appraised  value of the entire  Asset and the product  thereof  shall be used to
calculate the Allocable Portion Percentage of such Asset for the purposes of the
immediately preceding sentence.

                  4.10. Borrower shall not (A) prepay,  defease,  redeem, retire
or  otherwise  acquire  any  obligation  or  Indebtedness  owed by it  except as
permitted by this Promissory Note, as required by Section 3.8 of this Promissory






                                       16











Note or as required by any Permitted SPV  Indebtedness,  (B) cancel,  forgive or
waive any claim,  debt or Indebtedness  owing to it, (C) declare any dividend or
other  distribution or incur any liability in respect  thereof,  with respect to
the membership  interests (or any other equity  interest) in Borrower other than
(1) beginning as of April 1, 1997, payable in the next following calendar month,
the Equity Dividend Amount and any accrued and unpaid Equity Dividend Amount for
each month thereafter,  (2) amounts equal to equity  contributions made pursuant
to the Keep Well which have not been previously  recouped through the payment of
any dividend or distribution  and (3) amounts equal to any reduction of the Cash
Amount pursuant to Section 4(c) or Section  4(d)(ii) of the Purchase  Agreement;
provided,  however,  that  during  any  period in which any  payment  under this
Promissory Note is overdue or a Default has occurred and is continuing, Borrower
shall not declare,  pay,  incur any liability in respect of or make any dividend
or other distribution whatsoever but Borrower may continue to accrue a liability
equal to the Equity  Dividend  Amount  during such period and  Borrower may make
payments in respect of any such accrued  liability so long as no amounts due and
payable under this  Promissory Note are overdue and no Default is continuing and
provided,  further,  that all dividends or  distributions  by Borrower  shall be
declared,  paid or made only in accordance with applicable law, or (D) incur any
liability to, or engage in any purchase,  redemption or retirement  transaction,
with  respect to the  membership  interests  (or any other  equity  interest) of
Borrower.

                  4.11. Borrower shall not directly or indirectly enter into any
employee  benefit  plan as  defined  in  Section  3(3) of  ERISA,  nor any other
employee  benefit   arrangements  or  payroll  practices,   including,   without
limitation,  severance pay, sick leave,  vacation pay, salary  continuation  for
disability,  consulting or other compensation agreements,  retirement,  deferred
compensation,  bonus, stock purchase,  hospitalization,  medical insurance, life
insurance or scholarship programs.

         5.0  Events of  Default.  The  following  shall be  Events  of  Default
hereunder:

                  5.1.  Borrower  shall fail to make any payment of principal or
interest owing in respect of this Promissory Note including, without limitation,
any prepayment required pursuant to Section 3.8 hereof, when due and payable.

                  5.2.  Borrower  shall  fail to make any  payment  of any other
amount owing in respect of this  Promissory Note within five (5) days after such
other amount becomes due and payable.

                  5.3.  Borrower  shall fail to perform,  keep or observe any of
the covenants contained in Sections 3, 4 or 8 of this Promissory Note.





                                       17











                  5.4. Borrower shall fail to perform, keep or observe any other
provision of this  Promissory  Note or any provision of the Security  Agreement,
and the same shall remain unremedied for a period of ten (10) days after receipt
of written notice thereof from Lender.

                  5.5. Any representation or warranty made herein by Borrower or
in any  Ancillary  Agreement to which it is a party shall be untrue or incorrect
in any material respect as of the date when made.

                  5.6. Any provision of the Security  Agreement,  the Keep Well,
the  Keep  Well  Guaranty  or the Loan  Guaranty  shall  cease  to be valid  and
enforceable in any material respect in accordance with its terms.

                  5.7. Any Person  (other than Lender)  shall fail or neglect to
perform,  keep or observe any  provision  of any of the  Ancillary  Agreement to
which it is a party,  and the same shall remain  unremedied  for a period of ten
(10) days after receipt by such Person of written notice thereof from Lender.

                  5.8.  Any other event shall have  occurred  which would have a
Material Adverse Effect.

                  5.9. Final judgment or judgments  (after the expiration of all
times to appeal  therefrom) for the payment of money in excess of $297,480 shall
be  rendered  against  Borrower  and the  same  shall  not be fully  covered  by
insurance or vacated,  stayed, bonded, paid or discharged for a period of thirty
(30) days.

                  5.10.  There  shall  occur any  default  under any  agreement,
document or instrument to which  Borrower is a party or by which Borrower or any
of  Borrower's  property is bound (other than this  Promissory  Note),  and such
default results in the acceleration,  maturity,  demand or required repayment of
Indebtedness or other obligations due thereunder that singly or in the aggregate
exceeds $297,480.

                  5.11. Borrower shall fail to maintain insurance as required by
Section 3.6 of this Promissory Note.

                  5.12.  Any of the assets (with value,  individually  or in the
aggregate, in excess of $297,480) of Borrower shall be attached,  seized, levied
upon or subjected to a writ or distress  warrant,  or come within the possession
of any receiver,  trustee, custodian or assignee for the benefit of creditors of






                                       18











Borrower and shall remain  unstayed or undismissed  for thirty (30)  consecutive
days; or any person other than  Borrower  shall apply for the  appointment  of a
receiver,  trustee  or  custodian  for any of the assets of  Borrower  and shall
remain  unstayed or undismissed  for thirty (30)  consecutive  days; or Borrower
shall have concealed,  removed or permitted to be concealed or removed, any part
of the  property  of  Borrower  with  intent to  hinder,  delay or  defraud  its
creditors  or any of them or made or suffered a transfer of any of its  property
or the incurring of any  obligation  which may be fraudulent  under  bankruptcy,
fraudulent conveyance or other similar law.

                  5.13. A case or proceeding  shall have been commenced  against
Borrower in a court having competent  jurisdiction  seeking a decree or order in
respect  of  Borrower  (i) under  title 11 of the  United  States  Code,  as now
constituted or hereafter  amended,  or any other  applicable  Federal,  state or
foreign bankruptcy or other similar law, (ii) appointing a custodian,  receiver,
liquidator,  assignee, trustee or sequestrator (or similar official) of Borrower
or of any substantial  part of its properties,  or (iii) ordering the winding-up
or  liquidation  of the affairs of Borrower  and such case or  proceeding  shall
remain  undismissed or unstayed for thirty (30)  consecutive  days or such court
shall  enter a decree  or order  granting  the  relief  sought  in such  case or
proceeding.

                  5.14.  Borrower shall (i) file a petition seeking relief under
title 11 of the United States Code, as now constituted or hereafter amended,  or
any other applicable Federal,  state or foreign bankruptcy or other similar law,
(ii) consent to the  institution of  proceedings  thereunder or to the filing of
any such petition or to the appointment of or taking  possession by a custodian,
receiver, liquidator, assignee, trustee or sequestrator (or similar official) of
Borrower or of any  substantial  part of the  property of  Borrower,  (iii) fail
generally  to pay its debts as such debts  become due or (iv) take any action in
furtherance of the foregoing.

                  Upon the  occurrence  and during the  continuance  of any such
Event of Default under Sections 5.1 through 5.11 hereof,  the holder hereof may,
by  written  notice to  Borrower,  declare  the  entire  unpaid  balance of this
Promissory  Note to be  immediately  due and payable,  whereupon  the same shall
forthwith mature without  presentment,  demand,  protest or other notice, all of
which are hereby waived.  Upon the occurrence and during the  continuance of any
Event of Default under Sections 5.12 through 5.14 hereof,  this  Promissory Note
shall  immediately  mature and be due and payable without  presentment,  demand,
protest or other notice, all of which are hereby waived.






                                       19











         6.0 Purchase, Assignment and Assumption Agreement. This Promissory Note
represents  the Note Amount due under the  Purchase  Agreement in respect of the
Transferred Interests.

         7.0  Security  Agreement.  All  obligations  due  Lender  by  Borrower,
including, without limitation, those evidenced by this Promissory Note, shall be
secured pursuant to the Security Agreement.

         8.0 Costs and Expenses.  Borrower shall reimburse Lender for all of its
costs and expenses  (including  reasonable  attorneys'  fees)  incurred by it in
connection with the indebtedness  evidenced  hereby,  lien searches and filings,
the Security  Agreement  and related  documents  and any  amendments  thereto or
waivers or modifications thereof; provided,  however, that Borrower shall not be
obligated to pay any costs or expenses  (including  attorney's fees) incurred by
Lender in  connection  with  preparation  of this  Promissory  Note or any other
Ancillary Agreement or any ordinary  administrative costs and expenses of Lender
in the absence of a default by Borrower under this  Promissory Note or any other
Ancillary Agreement to which it is a party. Borrower shall also reimburse Lender
or any other holder hereof for all costs  incurred by it  (including  reasonable
attorneys'  fees) in the enforcement or collection of any amounts due under this
Promissory  Note.  Borrower  shall  indemnify and hold Lender  harmless from and
against all losses, claims, damages, costs and expenses, arising from the seller
financing  evidenced by this  Promissory Note or the  transactions  contemplated
hereby; provided,  however, that such indemnity obligation shall not limit or be
deemed to limit Borrower's rights under Section 13 of the Purchase Agreement.

         9.0 No Waiver.  No delay,  failure or omission by the holder  hereof in
respect of any default by Borrower  to exercise  any right or remedy  granted to
the holder  hereof or allowed to the  holder  hereof by law shall  constitute  a
waiver  of the  right to  exercise  such  right or remedy  upon any  default  or
subsequent default.

         10.0   Notices.   All   notices,   demands,   declarations   and  other
communications required by this Promissory Note shall be in writing and shall be
effective  (i) if  given  by  facsimile,  when  transmitted,  (ii) if  given  by






                                       20











registered or certified mail, three (3) Business Days after being deposited with
the U.S. Postal Service,  (iii) if given by courier,  when received,  or (iv) if
personally delivered, when so delivered, addressed:

                  If to Borrower, to:

                             Triton Aviation Services IV LLC
                             55 Green Street, Suite 500
                             San Francisco, CA  94111
                             Attn:  President
                             Facsimile Number:  (415) 398-9184

or to such  other  address as  Borrower  shall  from time to time  designate  in
writing to Lender; and

                  If to Lender, to:

                             c/o Polaris Investment Management Corporation
                             201 Mission Street, 27th Floor
                             San Francisco, CA  94105
                             Attention:  President
                             Facsimile Number:  (415) 284-7460

                  With a copy to:

                             c/o Polaris Investment Management Corporation
                             201 High Ridge Road, 1st Floor
                             Stamford, CT  06927-4900
                             Attention:  Portfolio Management
                             Facsimile Number:  (203) 357-4585

or to such other address as Lender may from time to time designate in writing to
Borrower.

         11.0 Confidentiality. Lender agrees that it shall keep confidential all
information  regarding  Borrower  that it may  receive  in  connection  with the
transactions  contemplated  by this Promissory Note and agrees that it will only
use such information in connection with such  transactions and will not disclose
any of such information  other than (i) to its directors,  officers,  employees,
advisors,  auditors,  agents or  representatives  who are or are  expected to be
involved  in  the  evaluation  of  such  information  in  connection  with  such
transactions and who are advised of the confidential nature of such information





                                       21












(and for whose  compliance  Lender  shall be  liable),  (ii) to the extent  such
information  presently  is  or  hereafter  becomes  available  to  Lender  on  a
non-confidential  basis from a source other than  Borrower,  (iii) to the extent
such information has been independently  acquired or developed by Lender without
violating  any of its  obligations  under this  Promissory  Note, or (iv) to the
extent disclosure is required by law, regulation or judicial order.

         12.0 Permitted Indebtedness. Lender agrees to execute from time to time
a certificate  verifying  whether or not Lender has declared an Event of Default
that  is  continuing  as of  the  date  of  such  certificate  and  stating  the
outstanding  principal amount of and interest accrued on this Promissory Note as
of the date of such certificate as Borrower may reasonably request in connection
with incurring Indebtedness for hushkit financing that is permitted by the terms
of this Promissory Note.

         13.0 No Recourse to Members. Without impairing any of the other rights,
powers, privileges, liens or security interests of Lender hereunder or under any
other  Ancillary  Agreement  (which term for purposes of this Section 13.0 shall
include  the  Purchase  Agreement),  Lender and each  subsequent  holder of this
Promissory  Note  agrees  that  (i)  the  obligations  of  Borrower  under  this
Promissory Note and the other Ancillary Agreements,  howsoever created,  arising
or  evidenced,  whether  direct or  indirect,  absolute  or  contingent,  now or
hereafter  existing,  or due or to become due,  including,  without  limitation,
obligations  relating  to  principal,  interest or any breach by Borrower of any
representation,  warranty,  covenant or  indemnity  made by  Borrower,  shall be
payable  only  from  the  assets  of  Borrower,   and  all  of  the  statements,
representations,  covenants and  agreements  made by Borrower  herein and in any
other  Ancillary  Agreement  are  made and  intended  only  for the  purpose  of
establishing  the  existence of rights and remedies  which can be exercised  and
enforced against the assets of Borrower;  and (ii) no recourse shall be had with
respect to any  representation,  warranty,  covenant or  indemnity  made by this
Promissory Note or any other Ancillary  Agreement against any member of Borrower
or any  officer,  director,  employee,  trustee,  servant or direct or  indirect
controlling  Person or Persons of any member, and no such Persons shall have any
personal  liability  for any  amounts  payable  hereunder  or  under  any  other
Ancillary  Agreement or for any damages for breach thereof;  provided,  however,
nothing  contained in this Section 13.0 shall be construed to limit the exercise
or enforcement,  in accordance with the terms hereof or any Ancillary Agreement,
of rights and  remedies  against the assets of Borrower;  and provided  further,
however,  that  nothing  in this  Section  13.0  shall (A)  release  any  Person
(including,  without  limitation,  any member or the manager of  Borrower)  from
personal  liability  for any  obligation  of such  Person  under  any  Ancillary
Agreement  to which it is a party,  howsoever  created,  arising  or  evidenced,
whether direct or indirect,  absolute or contingent,  now or hereafter existing,






                                       22












or due or to become due, including, without limitation,  obligations relating to
(1) breach by such Person of any representation, warranty, covenant or indemnity
made by such  Person or (2) any  actual  fraud by the  manager  or any member of
Borrower,  or (B)  release  TIL from  personal  liability  for any breach of its
obligations  under or  resulting  from the  breach by TIL of any  representation
warranty, covenant or indemnity made by TIL pursuant to the Loan Guaranty or the
Keep Well  Guaranty  or  release  TASL from  personal  liability  for any of its
obligations  under or resulting  from the breach by TASL of any  representation,
warranty,  covenant or indemnity  made by TASL  pursuant to the Keep Well or the
Security  Agreement.  For  purposes of this  Promissory  Note and the  Ancillary
Agreements,  the assets of Borrower shall in no event include,  nor shall Lender
or any  subsequent  holder  have any  recourse  against or claim to, any deficit
capital  account owed to Borrower by a member of Borrower,  except to the extent
of  distributions  made to such member by Borrower in  violation of the terms of
this Promissory Note.

         14.0  Waiver of Trial by Jury.  THE PARTIES  HERETO  WAIVE ALL RIGHT TO
TRIAL BY JURY IN ANY  ACTION OR  PROCEEDING  TO  ENFORCE OR DEFEND ANY RIGHTS OR
REMEDIES HEREUNDER, OR UNDER THE SECURITY AGREEMENT.

         15.0 Waiver. Borrower and all endorsers and guarantors hereby severally
waive demand, presentment,  notice of dishonor, diligence in collection,  notice
of protest, notice of intent to accelerate, notice of acceleration, and agree to
all extensions and partial payments before or after maturity,  without prejudice
to the holder of this Promissory Note.






                                       23











         16.0.  Governing  Law.  THIS  PROMISSORY  NOTE  SHALL BE DEEMED TO BE A
CONTRACT UNDER,  AND SHALL BE GOVERNED BY,  CONSTRUED AND ENFORCED IN ACCORDANCE
WITH THE LAWS OF THE  STATE OF  CALIFORNIA,  WITHOUT  REGARD  TO THE  PRINCIPLES
THEREOF RELATING TO CONFLICT OF LAWS.

                                            TRITON AVIATION SERVICES IV LLC

                                            By:  Triton Aviation Services
                                                    Limited, Manager



                                            By:/S/JOHN E. FLYNN
                                               ------------------------
                                            Name:  JOHN E. FLYNN
                                            Title: PRESIDENT


Accepted and Acknowledged by

POLARIS AIRCRAFT INCOME FUND IV

By:  Polaris Investment Management
         Corporation, General Partner

By:/S/MARC A. MEICHES
   ----------------------------------
Name:  MARC A. MEICHES
Title: VICE PRESIDENT







                                       24












                                   SCHEDULE A

                       Principal Payments as a Percentage
                               of Original Balance

              Principal               Balloon                  Total
              Payments                Payment                Payments
              --------                -------                --------
              1.9047%                                        1.9047%
              1.9618%                                        1.9618%
              2.0207%                                        2.0207%
              2.0813%                                        2.0813%
              2.1437%                                        2.1437%
              2.2080%                                        2.2080%
              2.2743%                                        2.2743%
              2.3425%                                        2.3425%
              2.4128%                                        2.4128%
              2.4852%                                        2.4852%
              2.5597%                                        2.5597%
              2.6365%                                        2.6365%
              2.7156%                                        2.7156%
              2.7971%                                        2.7971%
              2.8810%                                        2.8810%
              2.9674%                                        2.9674%
              3.0564%                                        3.0564%
              3.1481%                                        3.1481%
              3.2426%                                        3.2426%
              3.3398%                                        3.3398%
              3.4400%                                        3.4400%
              3.5432%                                        3.5432%
              3.6495%                                        3.6495%
              3.7590%                                        3.7590%
              3.8718%                                        3.8718%
              3.9879%                                        3.9879%










                       Principal Payments as a Percentage
                               of Original Balance

              Principal               Balloon                  Total
              Payments                Payment                Payments
              --------                -------                --------

              4.1076%                                         4.1076%
              4.2308%                 18.23%                 22.4619%
              0.0000%                 0.0000%                 0.0000%
              0.0000%                 0.0000%                 0.0000%
              0.0000%                 0.0000%                 0.0000%
              0.0000%                 0.0000%                 0.0000%
              -------                 -------                 -------
              81.7689%               18.2311%                100.0000%