about flying 707's
I think your best bet would be to get your hands on one of the many
converted tankers that are still in good flying conditions and are currently quickly fased out in many militaries.
E.g. an old RAAF tanker, ex Chili air force tanker, maybe an ex Israeli bird.
Also they do carry windows sometimes IIRC, so that would certainly add to realism.
Or how about leasing one of SAHA air's 707's, provided you can get the paperwork done between the US and IRAN, that's gonna be more difficult ,I
would guess.