And those modified aircraft were actually flown of a US carrier as well for the filming.....
And they flew the film formation in on the same route in as they actually did on Dec 7th.
And if I recall correctly, the two P-40's depicting those flown by George Welsh and KenTaylor taking off from Haleiwa airstrip was actually filming at Haleiwa airstrip.
I think Tora, Tora, Tora was one of those rare well executed Hollywood war movies....and certainly up there with the best.