They were real aircraft, but I'm guessing non-airworthy, obtained relatively cheaply ( by movie company standards ), and it would have been thought acceptable to do what was done for the purposes of the required "drama" in the movie at that time.
Movie companies spend a lot of money on things which could be ultimately wrecked during filming.
I was fortunate enough to be on the set during part of the filming of the James Bond movie "Goldeneye", back in 1995. During the tank chase sequence, a few Lada Police cars are damaged or wrecked. In the hangar at the studios at Leavesden, I saw at least twenty wrecked or damaged brand-new Ladas, and a number of other brand-new ones waiting for use, with a few wrecked Zils, where one is seen in the movie. All of this presumably due to "re-takes" of the scenes. There was probably in excess of £150,000 worth of new vehicles, purchased just to wreck, which is around £296,000 at todays value !
EDIT:- Regarding the stripes - in the movie, they certainly look to have a more greenish grey tinge, not far from the shade of RLM 02, or a slate grey colour.