Airplanes over the past 90 or so years have changed a lot. We have gone from small, propeler driven, fragile, all fabric and wood, 100mph top speed aircraft only able to reach 200 feet in the air at...
This depends on what you're trying to say. "On the airplane" implies that something is literally on the outside of the airplane, such as the logo, paint, or something sitting on the wings. "In the...