wow, you went to all that trouble to dig up regulations that will never be inforced??
And I know all about liability,,,I've been in the ama on and off for 30years

And lastly no one is saying using 72mhz in a land application,,I was just curious so I tested it

If swapping crystals is illegal then why do all the manufatures sell replacement crystals? or extra ones so you CAN change the Tx frequency? I guess the are just law breakers

I did mean to say that futaba explains how to change airtronics radios, they tell how to change their 72 to 75,,,sorry if that was confusing
http://www.futaba-rc.com/faq/faq-6xsuper-q54.html

Good luck DestroyerX