I have no idea on JR or Airtronics but this is straight from the Futaba. With our 72mhz frequencys ranging from ch11 through ch60. They are broken down into two sections (ch11-35) and (ch36-60) You can change them around yourself within those two areas, do a range check and if your happy go with it, if not,send it in.
* Lets say you have channel 32 and you want 55. Cannot do it because your crossing over. Oh you can but you better send it off with your receiver. Everything i own is on the same frequency. Life is easier this way.
* As far as the FCC goes, I was an Army pilot for 20 years and fooling around with things the last 10. I never even met anyone from the FCC. Never knew anyone who was fined. Hams etc. Absolutely nothing. They are ghosts and probably have better things to do. There interests in us is as important as a 6 month old obituary buried in a 4 week old Sunday paper!