Why do I have to say 'by plane', 'by car' etc.?

[manish]

Test No. incompl/elem-17 "White Water Rafting", question 7

You must be joking. Have you forgotten how terrible I felt the last time we went somewhere ......... plane?

(a) in
(b) with
(c) by

Test No. incompl/elem-17 "White Water Rafting", answer 7

You must be joking. Have you forgotten how terrible I felt the last time we went somewhere by plane?

Correct answer: (c) by

Your answer was: incorrect
You must be joking. Have you forgotten how terrible I felt the last time we went somewhere in plane?
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why its BY PLANE why not in plane?

[Torsten]

Because you can go by train, by car, by bus, by ship and of course, by plane. We use the preposition by in connection with the verb go and a vehicle.
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