A Round turn and 2 1/2 hitches (or variants of that) works pretty well. It's about the only one I do for aircraft. Easy to tie, (relatively) easy to undo, doesn't weaken the rope, etc.
Just did a 2 minute google search, and this website had a decent amount of info.
The Most Useful Rope Knots for the Average Person to Know
From what I've seen, most pilots can't tie knots, and just do "If you can't tie knots, tie lots"
DIVOSH!