The FAA doesn't care about range but is pretty excited about altitude (keeping it low), being away from airports, and being under direct human observation/control or if doing first person video with goggles having some kind of backup.
The FCC is who gets annoyed when long distance folks do the "CB linear" attitude and basically ignore all power regulations to get range.
Most of the civilians doing research and "production" flights currently are more likely to be violating various DEA laws with somewhat more draconian penalties than the FAA or FCC would every enforce anyway. 10 Kg of coke is going to be problematic to talk your way out of.
My experience with traditional RC planes is anything liquid fueled is audible for at least half a mile unless you go to some effort, but electric assist gliders, although huge and highly visible, are nearly inaudible maybe 10 feet away unless you're doing something dumb (running the prop tips supersonic to get more thrust, etc). A glider would also have much better range. Lets just say you should be wearing hearing protection when tuning a 0.40 sized RC airplane engine without a muffler, and probably while a muffler is installed too. Its a lot louder than you'd expect based on experience with yard work equipment (other than a chainsaw... A chainsaw is a pretty good comparison...)
My multicopter sounds like a weedwhacker in operation, and I can easily hear the 5volt beeper go off 30 feet away when the battery voltage drops too low. I donno maybe 50 feet away you wouldn't notice it? This is a 210mm sub 250g build, I'm sure a monster sized aircraft has monster sized noise to match.