The major disadvantage of air transportation compared with land transportation is that
-
A.
an aircraft can fly above terrestial obstacles and therefore has a much wider choice of routes -
B.
air transport is much more expensive to develope, build and maintain -
C.
air transportation is faster in speed, enabling to make much more frequent runs -
D.
air transportation is much more suitable for international information exchange systems -
E.
air transportation is much more flexible