That company's reaction to longline work is:
"We've never done it, because there's no requirement"
yet they're 30 feet over a salmon tank, stressing the fish with the downwash, and if the engine quit they'd hit the side of the tank with no chance of getting clear, so it's mirrors, in the good traditional way! Or they're dumping concrete at the bottom of a cell tower with the top of the aerial about 4 feet away from you!
I've always used short or longline according to circumstances, but I wouldn't dismiss either out of hand.
Yes, I know the requirements - pm me for details
How are you
PR?
Phil