Where I live we rarely use standby, we get them en route to the biggest crashes or whatnot and then when we get there we cancel them if we don't need them. I have seen them straight overhead at cancel and they just say have a nice day and fly away. No bill. They know our situation and they are happy to be of service when they can be and they don't get butt hurt if we cancel them. I wouldn't say this is a frequent occurrence but it happens every once in awhile.