Andrew's word for "airplane" is "up-up." He says it when a plane flies over our house and when we are about to board a plane at the airport.
So just now I'm on my computer getting some stuff done and I go to the united.com account sign in page, which is mostly blank - it just has the United logo on it.
Andrew looks over my shoulder, points right to the United logo and says "Oh yeah - up-up! Up-up!!!"