EXHIBIT 4.2

                                UAL CORPORATION
                             Officer's Certificate
                             ---------------------

          Pursuant to Sections 2.1 and 3.1 of the Indenture, dated as of April
3, 1995 (the "Indenture"), between UAL Corporation, a Delaware corporation (the
"Company"), and The Bank of New York, a New York banking corporation, as trustee
(the "Trustee"), the undersigned officer of the Company hereby certifies on
behalf of the Company as follows:

          1.  Authorization.  The establishment of a series of Securities of the
Company has been approved and authorized in accordance with the provisions of
the Indenture pursuant to resolutions adopted by the Board of Directors of the
Company on December 15, 1994 and January 26, 1995.

          2.  Compliance with Covenants and Conditions Precedent.  All covenants
and conditions precedent provided for in the Indenture relating to the
establishment of series of Securities have been complied with.

          3.  Terms.  The terms of the series of Securities established 
pursuant to this Officer's Certificate will be as follows:

          (i)      Title.  The title of the Securities is "6 3/8% Convertible
                   Subordinated Debentures due 2025" (the "Debentures").

          (ii)     Aggregate Principal Amount.  The aggregate principal amount
                   of the Debentures which may be authenticated and delivered
                   under the Indenture (except for Debentures authenticated and
                   delivered upon registration of transfer of, or in exchange
                   for, or in lieu of, other Debentures pursuant to Sections
                   3.4, 3.5, 3.6, 8.6 or 10.7 of the Indenture and except for
                   any Debentures that, pursuant to the last paragraph of
                   Section 3.3 of the Indenture, are deemed never to have been
                   authenticated and delivered under the Indenture) will not
                   exceed $600,000,000.

 
          (iii)    Stated Maturity.  The date on which the principal of the
                   Debentures is payable is February 1, 2025.

          (iv)     Rate of Interest; Interest Payment Dates; Regular Record
                   Dates.  The Debentures will bear interest at the rate of 
                   6 3/8% per annum, except that holders of record of the
                   Debentures will be entitled to interest at a rate of 6 1/4% 
                   per annum from February 1, 1995 through April __, 1995 in 
                   lieu of dividends accumulating after January 31, 1995 on
                   the Series A Preferred Stock.  The date from which such
                   interest will accrue is April __, 1995.  The Interest Payment
                   Dates on which such interest will be payable are February 1,
                   May 1, August 1 and November 1 of each year, commencing May
                   1, 1995, subject to extension as provided in the form of
                   Debenture attached hereto as Exhibit A.  The Regular Record
                   Date for the interest payable on any Interest Payment Date
                   will be the January 15, April 15, July 15 or October 15 prior
                   to such Interest Payment Date.

          (v)      Place of Payment.  The principal of and interest on the
                   Debentures will be payable at the office or agency of the
                   Company maintained for that purpose in the City of New York
                   (which, unless changed, will be a corporate trust office or
                   agency of the Trustee); provided, that at the option of the
                   Company, payments may be made by checks mailed by the Trustee
                   to the Holders of the Debentures at their registered
                   addresses or by wire transfers to accounts maintained by the
                   Holders as specified in the Register, provided that the
                   payment of principal with respect to any Debenture will be
                   made only upon surrender of such Debenture to the Trustee.

          (vi)     Optional Redemption.  The Debentures will be redeemable at
                   the option of the Company after meeting certain conditions
                   set forth in the form of Debenture attached hereto as Exhibit
                   A, in whole or in part, on or after May 1, 1996 at the
                   following percentages of the principal amount thereof
                   redeemed, plus accrued and unpaid interest, if any, up to but
                   excluding the Redemption Date, if redeemed during the twelve-
                   month period commencing May 1 of the

                                      -2-

 
                   years indicated:

                   Year                            Redemption Price
                   ----                            ----------------

                   1996                            104.375%
                   1997                            103.750%
                   1998                            103.125%
                   1999                            102.500%
                   2000                            101.875%
                   2001                            101.250%
                   2002                            100.625%
                   2003 and thereafter             100.000%

                   Notice of redemption will be mailed at least 30 days but no
                   more than 60 days before the Redemption Date to each Holder
                   at its registered address.  If fewer than all the outstanding
                   Debentures are to be redeemed, the provisions of Section 10.3
                   of the Indenture will govern.

          (vii)    Mandatory Redemption.  The Debentures will contain no 
                   provision for mandatory redemption, a sinking fund or
                   analogous provisions.

          (viii)   Denominations.  The Debentures will be issuable in
                   denominations of $1,000 and integral multiples thereof.

          (ix)     Currency.  The Debentures will be denominated in Dollars and
                   the principal of and interest on the Debentures will be
                   payable in Dollars.  The Debentures will be satisfied and
                   discharged as provided in Article 4 of the Indenture.

          (x)      Payment Currency.  The principal of and interest on the
                   Debentures will not be payable in a currency other than
                   Dollars.

          (xi)     Formula.  The amount of payments of principal of and interest
                   on the Debentures will not be determined with reference to an
                   index, formula or other method.

          (xii)    Amount Payable Upon Acceleration.  The principal amount of 
                   the Debentures payable upon declaration of acceleration will
                   be governed by Section 5.2 of the Indenture.

          (xiii)   Payment of Interest.  The payment of interest on the
                   Debentures will be governed by Sections

                                      -3-

 
                   2.3 and 3.7 of the Indenture.

          (xiv)    Special Rights.  There are no provisions granting special
                   rights to the Holders upon the occurrence of specified
                   events.

          (xv)     Covenants; Events of Default.  The covenants set forth in
                   Section 9.8 of the Indenture will also apply if the Company
                   exercises its right to extend the interest payment period for
                   an Extension Period (as defined in the Debenture).  These
                   restrictions will apply until any such Extension Period has
                   terminated.

                   An additional Event of Default occurs with respect to the
                   Debentures if (whatever the reason for such Event of Default
                   and whether it shall be occasioned by the provisions of
                   Article 12 of the Indenture or be voluntary or involuntary or
                   be effected by operation of law or pursuant to any judgment,
                   decree or order of any court or any order, rule or regulation
                   of any administrative or governmental body):

                   The Company defaults during an Extension Period under the
                   terms of any agreement or instrument evidencing or under
                   which the Company has outstanding any indebtedness for
                   borrowed money and such indebtedness shall be accelerated so
                   that the same shall be or become due and payable prior to the
                   date on which the same would otherwise become due and payable
                   and the aggregate principal amount thereof so accelerated
                   exceeds $150,000,000 and such acceleration is not rescinded
                   or annulled within ten days after there has been given, by
                   registered or certified mail, to the Company by the Trustee
                   or to the Company and the Trustee by the Holders of at least
                   25% in aggregate principal amount of the Outstanding
                   Securities of that series a written notice specifying such
                   default and stating that such notice is a "Notice of Default"
                   under the Indenture; (it being understood however, that,
                   subject to the provisions of Section 6.1 of the Indenture,
                   the Trustee shall not be deemed to have knowledge of such
                   default under such agreement or instrument unless either (A)
                   a Responsible Officer of the Trustee shall have actual
                   knowledge of such default or (B) a Responsible Officer of the
                   Trustee shall have received

                                      -4-

 
                   written notice thereof from the Company, from any Holder,
                   from the holder of any such indebtedness or from the trustee
                   under any such agreement or other instrument); provided,
                   however, that if such default under such agreement or
                   instrument is remedied or cured by the Company or waived by
                   the holders of such indebtedness, then the Event of Default
                   hereunder by reason thereof shall be deemed likewise to have
                   been thereupon remedied, cured or waived without further
                   action upon the part of either the Trustee or any of such
                   Holders.

          (xvi)    Additional Amounts.  The Company will not pay additional
                   amounts on the Debentures held by a Person that is not a U.S.
                   Person in respect of taxes or similar charges withheld or
                   deducted.

          (xvii)   Registered Securities.  The Debentures will be issuable as
                   Registered Securities, without interest coupons.  Section 3.5
                   of the Indenture will govern the Debentures.

          (xviii)  Bearer Securities; Temporary Global Security.  The Debentures
                   will not be Bearer Securities or represented by a temporary
                   global Security.

          (xix)    Defeasance and Covenant Defeasance.  Sections 4.4 and 4.5 of
                   the Indenture will not apply to the Debentures.

          (xx)     Registrar; Paying Agent.  The Trustee will be the Registrar
                   and the Paying Agent for the Debentures.

          (xxi)    Warrants.  No warrants will be issued in connection with the
                   Debentures.

          (xxii)   Exchange Rate Agent.  There will be no Exchange Rate Agent
                   with respect to the Debentures.

          (xxiii)  Permanent Global Form.  The Debentures will be represented by
                   a permanent global debenture (the "Global Debenture"), with
                   respect to which The Depository Trust Company will be the
                   Depositary.  Section 3.5 of the Indenture will govern the
                   Global Debenture.

          (xxiv)   Conversion.  The Debentures will be convertible at the option
                   of the Holders thereof at any time after the date of original
                   issuance

                                      -5-

 
                   thereof, unless previously redeemed, into $541.90 for each
                   $1,000 principal amount thereof and the number of fully-paid
                   and nonassessable shares of common stock of the Company
                   obtained by dividing (i) the difference between Principal
                   Amount (as defined in the Debenture) of the Debenture and
                   $541.90 by (ii) the Conversion Price (as defined in the
                   Debenture) and surrendering such Debentures to be converted
                   as provided in the form of Debenture attached hereto as
                   Exhibit A, provided, however, that the right to convert
                   Debentures called for redemption shall terminate at the close
                   of business on the day preceding the Redemption Date, unless
                   the Company shall default in making payment of the cash
                   payable upon such redemption.  The form of Debenture will
                   govern the other terms and conditions with respect to
                   conversion of the Debentures.

          (xxv)    Subordination.  Article 12 of the Indenture will govern the
                   terms and conditions under which the Debentures are
                   subordinate to the Senior Indebtedness of the Company.

          (xxvi)   Other Terms.  The Debentures will have the other terms and
                   will be substantially in the form set forth in the form of
                   Debenture attached hereto as Exhibit A and may have such
                   other terms as are provided in such form.  In case of any
                   conflict between this certificate and the Debentures in the
                   form attached hereto as Exhibit A, or between the Resolutions
                   and the Debentures in such form, the Debentures will control.

     Capitalized terms used herein and not otherwise defined herein have the
meanings specified in the Indenture.

     The undersigned, for himself, states that he has read and is familiar with
the provisions of Article 2 of the Indenture relating to the establishment of
the form of Security representing a series of Securities thereunder and Article
3 of the Indenture relating to the establishment of a series of Securities
thereunder, and in each case, the definitions therein relating thereto; that he
is generally familiar with the other provisions of the Indenture and with the
affairs of the Company and its acts and proceedings and that the statements and
opinions made by him in this Certificate are based upon such familiarity; that,
in his opinion, he has made such examination or investigation as is necessary to
enable him to

                                      -6-

 
express an informed opinion as to whether or not the covenants and conditions
referred to above have been complied with; and, that in his opinion, the
covenants and conditions referred to above have been complied with.

     Insofar as this Certificate relates to legal matters, it is based, as
provided for in Section 1.3 of the Indenture, upon the opinion of Counsel
delivered to the Trustee contemporaneously herewith pursuant to Section 3.3 of
the Indenture and relating to the Debentures.

     IN WITNESS WHEREOF, the undersigned has hereunto signed this Certificate on
behalf of the Company this ___ day of April 1995.

                                         UAL CORPORATION


                                         By: ______________________
                                         Name: Douglas A. Hacker     
                                         Title: Senior Vice 
                                                President - Finance

                                      -7-