TASK DEFINITION: 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.
PROBLEM: airport : train. mainland : ?

SOLUTION: boat

PROBLEM: store : car. hawaii : ?

SOLUTION: airplane

PROBLEM: hawaii : airplane. mall : ?

SOLUTION:
bus