I just flew flagship 3714 the other day
It wasnt this flight that you were listening to though..we didnt have the amended callsign to 714A. Been a few weeks since ive had to use one of those.
We do the letter to the callsign to keep there from being confusion on the radio and 2 planes with the same callsign in the sky.
Flagship 3714 is the original flight callsign for this one (northwest airlink flight 3714).... if it comes within a certain amount of time of the continuation of the flight being in the air, we will have in our release "ATC CALLSIGN FLG
As far as the cabin being depressurized, the outflow valve is usually locked open by maintenance, and we dont cruise above 10,000 feet- 10,000 being the preference because you can accelerate above 250 KIAS at that altitude. ATC typically will try to climb us up higher, and we will refuse it...for obvious reasons. We do a greatly reduced power climb, only keeping about 400-500 fpm. In short- theres not much that we do that is different in an unpressurized flight.. I'll say something about it in my PA, apologizing for any uncomfort...and keep it gentle on the climbs and descents-refusing any expedites unless its an emergency...(first segment climb has to be normal profile though due to obastacle clearance).
Hopefully my ramblings made sense.
Chicks dig winglets.