Exhibit 24

United Continental Holdings, Inc.

Authorization and Designation to Sign and File Section 16 Reporting Forms and
Form 144s

        The undersigned, a member of the Board of Directors of United
Continental Holdings, Inc., a Delaware corporation (the "Company"), does hereby
authorize and designate Jennifer L. Kraft, Sarah Hagy, Sucheta Misra or Brett J.
Hart (the "Authorized Persons") to prepare, sign and file on her behalf: (i) any
and all Forms 3, 4, 5 and Form ID, including any amendments thereto, relating to
equity securities of the Company with the Securities and Exchange Commission
(the "SEC") pursuant to the requirements of Section 16 of the Securities
Exchange Act of 1934, as amended ("Section 16"), and the rules promulgated
thereunder; and (ii) any and all Forms 144 relating to equity securities of the
Company with the SEC pursuant to Rule 144 under the Securities Act of 1933, as
amended, in each case which may be necessary or desirable as a result of her
ownership of or transaction in securities of the Company. The undersigned
further hereby authorizes and designates the Authorized Persons to do and
perform any and all acts for and on her behalf as may be necessary or desirable
to prepare, sign and file the forms contemplated by this Authorization. The
undersigned hereby confirms any action relating to the preparation, signing and
filing of (i) and (ii) above, performed by the above mentioned individuals on
her behalf and revokes any prior Authorization and Designation to Sign and File
Section 16 Reporting Forms and Forms 144. This authorization, unless earlier
revoked in writing, shall be valid until the undersigned's reporting obligations
under Section 16 and Rule 144 with respect to securities of the Company shall
cease.

IN WITNESS WHEREOF, the undersigned has executed this Authorization and
Designation this 13th day of June, 2013.

                                        Signature:    /s/ Jane C. Garvey
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                                        Printed Name: Jane C. Garvey
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                                        Position:     Director
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