I just think that we shouldn't just think of the range as "only getting to Navarro". Thats a very very short range and any military aircraft designer worth his salt would avoid such an ineffective range of combat. A range of 500-1000 miles or so would help explain a few details. Like how the Enclave got to the east coast (prehaps they re-fueled in Chicago or something).
I like that you say "what military aircraft designer worth his salt" when you ignore that they blow up in apparently nuclear mushroom clouds when hit by small arms fire. (I've shot them down with assault rifle in FO3). Hence why I hate with a passion the hollywood effects added by gamesas. It makes no sense. Plus if you actually pay attention Very little cars made the jump to fusion power. The tech was extremely new at the time of the war. Only like a year or so for the public market. It was a military research project after all.
EDIT: Tune I'd like to see one suit of PA do the lifting a Vertibird does. XD I'm not making judgments I'm only telling you whats set down, it's not my fault you can't accept them. Vertibirds are designed as a short range VTOL aircraft, why can't you seem to accept it? OK your PA example. T-51b is said to have enough fusion power fuel for 100 years right?
It lifts 75 lbs for 100 years. I think that won;t cut it for a vertibird. You also have no Idea how that tech up scales again your making assumptions. I'm only dealing in "facts" as they are handed out in FO2.