Tora, Tora, Tora

This film was shown on ITV yesterday afternoon, yes I’ve seen it many times before including being at the late nght press premier when it first came out.
Father in law had never seen it before and couldn’t believe that it wasn’t archive footage, especially the scene when the Japanese a/c were taking off from the carrier.
Question is, were real a/c destroyed during the making of this film. I know that the P-40’s were dummies and that some of the scenes went nearly tragically wrong, but looking at the Catalinas being blown up and set on fire, well, they didn’t look like mock ups to me, nor did some of the smashed up B-17’s. Was the hangar that was blown up, at Hickam. It was a real hangar as it featured in a previous scene and was not a stage set as it was a steel framed building and had all the hall marks of a seriously damaged stuctural building.
Thinking about it, the film must have cost a fortune when it was made, did they get their money back.
Incidentally, some of the low level flying is well dodgy, especially when they strafe the truck, that really looks a close call.