there is no such thing as a european gps antenna.... gps is gps, it works everywhere. what doesn't work in europe is the cellular antenna. and what i had originally thought was that the ally and most phones are aGPS which is assisted GPS, which requires some sort of cellular or data connection to help the phone decode the incoming GPS signals. But if you turn the phone to airplane mode and thereby turn off its cellular radio, the GPS still seems to work here, but in spain it didn't which may be for a number of reasons that i can no longer verify, but once I turned on wifi when i was in spain, and connected to a wifi network, it then started to work. so i don't know what is going on. but it was a surprise to me that it worked here.
as for 100,000 ft, i'm not saying i want to go up there, just that google has recently done it and if GPS worked there, it really ought to work at 35,000 ft, unless the plane has some sort of interference blocking the signal, but that probably wouldn't be since cell phones work once you are within range in side the plane.