13G Filing: Senator Investment Group and Gogo Inc. (GOGO)

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SIGNATURES

After reasonable
inquiry and to the best of our knowledge and belief, the undersigned certify that the information set forth in this statement is
true, complete and correct.

DATE: as of December 14, 2017

SENATOR INVESTMENT GROUP LP
/s/ Evan Gartenlaub
Name: Evan Gartenlaub
Title: General Counsel
/s/ Evan Gartenlaub as Attorney-in-Fact*
ALEXANDER KLABIN
/s/ Evan Gartenlaub as Attorney-in-Fact*
DOUGLAS SILVERMAN

* Pursuant to a Power of Attorney attached to the Schedule 13G filed
by the Reporting Persons on April 24, 2013.

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