That's where I used to go, however the buzzards spawn there instead now.
Same here, i get buzzards spawning at the aiport, hospital roof, trevors airfield and the southern docks.
All i find in the military base too is fighter jets.
Can't believe rockstar would make them level based and not purchasable.
I don't mind it being level based, it's the fact that I can't find a permanent spawn point for each individual vehicle. It's so annoying, I thought the dock would stay as a permanent spot for the cargobob -_-