What makes me think it's happening? On a flight from San Jose to Atlanta last Thursday, a Delta flight attendant saw my HP tc1100 and said, "Oh, a tablet PC! I've got a Toshiba. Don't you just love it?"
In the past, flight attendants have said things like, "Wow! What a small laptop!" or "You're actually writing on the screen! How does that work?"
Now they're buying 'em. :-)