I do, yep. It works for aircraft, cars, and I think motorcycles and trains as well? Not that I've photographed many of those. Typically when I'm shooting an airshow, though, the only other features that might be in frame are the aircraft and then the clouds or smoke trails or something, so I don't feel like it's really necessary. There are times when I'll try to get a shot with more context in frame though, like I'll back up from the rest of the viewers to take a wider shot with a performer in the sky above the crowd or landscape or whatever, so I suppose it could come in handy to prioritize the aircraft over spectators or whatever.
