What items have to do with planes and trains?
One item in the combo has to do with planes, the other one has to do with trains.
What item has to do with trains?
Is there an item that would be connected with a plane in any way?
The plane item would only be found on a military plane.
The train item would be found near a train track.
What do military planes drop?
What is on the sides of roads near train tracks?