Taxiing

As we began our flight to Baltimore this weekend Aidyn was upset with the airplane because she wanted to fly and it kept "driving," as she called it.  I explained that the airplane can't take off here ("why mom?") because it can't just take off anywhere ("but why mom?") because it might hit the building if it takes off too close to the airport ("why mom?") because it needs to go out to the runway to take off ("why?") because that's the way airplanes are designed ("oh, I see").  Finally she asked what it's called when the airplane is driving and not flying yet and she learned a new word: taxiing.