I keep forgetting that no one outside part 121 knows this. Don't worry dude, for some reason this fact keeps on getting left out when recruiters come to schools and try to convince students that flying for an airline is 100% "living the dream". There is a reason hourly pay is higher than most professions. So to answer your question, YES every airline that I can think of only pays their crew when the door shuts till the door opens for the most part. Some may have a little difference in criteria but it all works out about the same. Good question though. Pass on the word when you can.