I was lucky and the winds were nil, meaning the hangar doors weren't banging loudly.

There have been days I've been up there and the winds picked up from just the right direction and the noise was so loud I had to quit! The sound just builds and reverberates from every hangar on the building to where it's quite impressive.

On the list of stuff to buy, a decent camera I can hook the wireless mic to is unfortunately down near the bottom. I'm just propping my GoPro onto a tripod for these, and it picks up huge amounts of ambient noise.