Our daughter has already been in a plane 14 times in her 20 month old life. But the last time we went to France, last Christmas holidays, I think she really grasped it and she was running around the plane like a mad person. Fortunately the plane was not full, so she had space to amuse herself. I think she also loves airports, as there is lots of space to run around, their are moving carpets, escalators, lifts, everything she finds interesting. I hope she will keep her love of planes and will discover the value of travelling as she gets older.