also called deadheading crew
Airline crew traveling as passengers to position for duty, which can fill seats and affect upgrade or oversale dynamics.
Deadhead is airline slang for crew flying as passengers to get themselves into position for their next duty, rather than working the flight. Those crew take up seats like anyone else, which can affect how full a cabin is and how upgrades or oversales play out. So it is a behind-the-scenes reason your flight might feel fuller, or your upgrade odds worse, than the booking looked.
You are hoping for an upgrade on a flight that looked wide open, then watch several off-duty crew board and settle into seats as passengers. Those deadheading crew have quietly filled the cabin, and the upgrade you were counting on evaporates because the flight was fuller than the map suggested.
You may see crew blocking seats or last-minute cabin changes that alter upgrade odds.
The difference is the whole point, so here is each one in a line.
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