amanoffewwords
When ever you witness an impromptu air display it is always good manners to write a short thank you note to the Chief Pilot of the organisation concerned. Be sure to include comments like
"how nice it was that they turned up completely unexpected"
"how the crew amazed the crowd with such skill at low level"
"how you were previously unaware that a rotor craft could be manoeuvred in such extreme ways"
The aircrews will really appreciate it and it is the polite thing to do. Go on... write today.
Oh... by the way, the technical term for "doing a 360" as you put it, is a "loop". Probably best to use the right terminology in your letter.
