No way to know, it seems.
But we can guess based on the sharp decline in quality in many of the green screen sequences. It’s the same in the PT, to a lesser degree. Whenever AOTC cuts to a green-screen re-shoot, the performance takes a nose dive.
I mean, why would you guess against the video evidence of Hemingway directing green screen cockpit footage?
Also, i’ve always wondered- why does Ewan have a fake beard in the re-shoots? Why did he shave if he knew they were coming back?