Ok, there is absolutely nothing obsolete about about the 6EXA radio. 72 Mhz radios still work perfectly well and there is no reason to think there is. I have 72 Mhz radios that are 10 years old that I use all the time. I also have 2.4 Ghz radios as well. But there is no reason to quit using something because it's not brand new.

mitchsnap,
There is nothing wrong with setting up each plane on the two radios. Keep your original plane on the Futaba and put the new one on the DX7. Or you can buy a new receiver for the DX7 and program both of the planes into the DX7. Also, with the DX7 you can't fly with the wrong model selected because of the ModelMatch feature that these radios have. If you don't have the proper model selected it won't work.

Ken