So I read the wiki and apparently there's a glitch that Jack disappears if you accept the mission, don't complete it and then finish Volare!, he "disappears" and becomes "stuck" in the old hangar with disassembled bomber. The only way to reset it is with console commands apparently.

I don't think I can do that on 360, if so, then how? Is this quest going to be stuck in my log forever? I'm seriously getting pissed off by the plethora of bugs that plague this game... I'd honestly prefer it if they didn't release any DLCs but spent that time fixing the numerous [censored] bugs plaguing the game.