I had success recently by using a Netgear Trek N300 travel router with Gogo on a DL AUS-LAX flight. I plugged it into a USB portable power bank, connected my laptop to it and had it connect to the Gogo hotspot. Logged in, redeemed a biz plat pass and I was then able to connect both my phone and my wife's phone to the travel router.

This also came in handy when our hotel in Vegas limited our WiFi connection to two devices per room.