Actually, the AA website says "Portable Global Positioning Satellites (G.P.S.)" So, if you want to split hairs, they don't want you using a *satellite* on board. Nothing about the handheld transceivers LOL I have a co-worker who has an aviation grade GPS unit for his iPaq (he's a pilot) and he routinely uses it for his personal plane as well as charter and commercial flights and he's never reported any problems using it.