In general, vehicles move just like characters do. There are a few exceptions for non-bipedal vehicles, however:
Depending on the method used to achieve flight, vehicles manoeuvre a little differently. If the vehicle is using fixed-wing movement, such as from jet engines or propellers, it risks stalling if it doesnét move at least 5 squares horizontally every round. Otherwise, flying vehicles can move up, down, and horizontally at their speed. This is a bit of an abstraction, but it keeps the game simple.
A stall occurs when a vehicle dependant on wings fails to achieve the requisite lift . This happens when the vehicle does not move at least 5 squares horizontally in a round. Jets and propellers stop functioning, and the vehicle must attempt to glide. To pull out of a stall, the pilot must succeed in a DC 8 pilot check as a 4SA. The DC decreases by 1 point every round after the vehicle begins to stall.