Why can't move air transport Corps

Enterprise owns a air transport corp but I can't move it and the pres has a 50+ tax rate rate

When I built it it was a C3 and 30 percent not someone has bought that country and is sufficating me with the 57 percent tax and I can't move it

Is it too young too move?

Disregard. Found the other thread.

Air Transport corps. automatically build an airport where they are created. Neither can be moved, I wish you could as I have the same problem.