Does “vehicle” usually include airplanes, aircrafts or spacecrafts? Or it mainly refers to wheeled vehicles, boats and ships?
The words mainly and usually are rather troublesome words in your question.
The meaning of vehicle – much like the meaning of any word with multiple definitions or interpretations – depends on the context. If I said, “It costs a lot to register a vehicle in Kentucky,” chances are I’m only referring to cars, pickup trucks, and motorcycles. However, if I work as a logistician for a major company, and I say, “We need to determine the best vehicles for getting these widgets from factory to market,” chances are I am referring ships, trains, large trucks, or aircraft. And if I talk about needing a vehicle to put a satellite into orbit, I don’t mean any of those things.
If I heard the word with no other context, as in a word