What about Independence Day? There's a Stearman in that, although I don't know how much it was modified.
Not sci-fi, but the Me-109 in the opening scenes of the first series of Land Girls was an Me-108 with stick-on "holes" where the guns were supposed to be.
Edit to add D.A.R.Y.L. - SR71 and A.I. Artificial Intelligence, various types.
Last edited by taybird; 13th Mar 2012 at 22:38.
Reason: Added a couple more