We have APU on demand at UAL and we operate over 350 737s. Really not all that hard to track. From time to time, we get a message asking for a reliability start enroute on a domestic leg. We cold start it when conditions are met and send a code and it gets logged appropriately. Easily accomplished. We send the MAX-9 to HNL occasionally but I've never flown anything to the islands but the NG (and of course the 757-300 and 767-400 years ago)