Flying off the shelves where? Not in the US. Heller doesn't have a distributor here. My understanding is that cycles have never sold well for either Reve/US or Germany. By "well", I mean in reasonable numbers to the casual builder and general consumer, not just the hard-core hobbyists who are mostly responsible for the flying kits.
I'm all for variety in kit reissues, but companies like Revell have to look at the big picture. No sleeping involved.
Model companies re-issueing old kits of a certain type is not a "resurgence". If they sell well and more get re-issued because of that, that's a "resurgence". Only time will tell, but by all means, continue the Revell-Bashing.
What, the radio? Not every 1959 Ford was born with a radio. Many cars from that era were ordered without one. Maybe the car AMT based the kit on didn't have one. My Dad's 58 Biscayne had a filler plate where the radio would normally be. He used to take his Sears "7 Transistor" pocket radio with him to listen to Cubs games on the go.
Mark is correct. I have at least one copy of every release of the 66 Buick Wildcat, including the original, and none of them have the road test parts. The original 65 GP had them, but I don't know if any subsequent releases did. However, the Wildcat is missing 2 parts from the original release. It had seperate side windows that you could use if you wanted to. They're mentioned on the plan for the Customizing series issue, but they weren't in the kit. I can only assume the mold containing them is lost.