X0306 4 2017-10-01 0 0001537054 Gogo Inc. GOGO 0001455402 Thorndale Farm LLC 63 FRONT STREET MILLBROOK NY 12545 0 0 1 0 0001135089 THORNE OAKLEIGH 63 FRONT STREET MILLBROOK NY 12545 1 0 1 0 Common Stock 25450823 I By LLC Common Stock 139536 I By LLC This form is not being filed to report a sale or other transaction, but for informational purposes only. On October 1, 2017, in connection with the long-term estate planning of Oakleigh Thorne and his family, certain trusts and other entities affiliated with Oakleigh Thorne and Thorndale Farm, L.L.C. contributed their directly held shares of common stock to a newly created entity, Thorndale Farm Gogo, LLC, in exchange for a pro rata share of the equity interests in Thorndale Farm Gogo, LLC. As a result, Thorndale Farm, L.L.C. no longer may be deemed to have beneficial ownership over any shares of common stock. Reflects shares of common stock held directly by Thorndale Farm Gogo, LLC. Thorndale Farm, Inc. is the managing member of Thorndale Farm Gogo, LLC. Mr. Thorne, as the chief executive officer of Thorndale Farm, Inc., may be deemed to have beneficial ownership of the shares of common stock held by Thorndale Farm Gogo, LLC. Mr. Thorne disclaims beneficial ownership of such shares of common stock except to the extent of any pecuniary interest therein and this report shall not be deemed an admission that Mr. Thorne is a beneficial owner of such shares of common stock for purposes of Section 16 or for any other purpose. Reflects shares of common stock held directly by OAP, LLC. Mr. Thorne, as the managing member of OAP, LLC, may be deemed to have beneficial ownership of the shares of common stock held by OAP, LLC. Mr. Thorne disclaims beneficial ownership of such shares of common stock except to the extent of any pecuniary interest therein and this report shall not be deemed an admission that Mr. Thorne is a beneficial owner of such shares of common stock for purposes of Section 16 or for any other purpose. Thorndale Farm, L.L.C., By: /s/ Oakleigh Thorne, Chief Executive Officer 2017-10-03 /s/ Oakleigh Thorne 2017-10-03