It's 75MHz that's for Surface use.

Anyway all of those are frequency BANDS. There are lots of CHANNELS available in each band. The channel is defined by the bit after the 72. though it's not as simple as quoting the numbers e.g 72.13 is Channel 17, 72.55 is Channel 38.

So long as you are on a different channel you're o.k.

And no you can't use the same transmitter for surface and air (unless it has exchangeable frequency modules).

Steve