Two analogies that relate places/locations to the associated travel mode is given in the form "A : B. C : ?". "A : B" relates place A to travel mode B. Your task is to replace the question mark (?) with the appropriate travel mode for the given place C, following the "A : B" relation.

mars : spaceship. canada : ?
car

canada : car. bermuda : ?
airplane

portland : car. store : ?

car