Uncommutable domestic trips doing multiple legs per day. Reserve rules aren’t bad so if you live in base it’s not terrible. Hard to tell how long they’ll be on reserve. In holiday months, reserve goes senior so they may not be able to hold reserve and be forced to a line. Either way, they’re working the holiday anyway. I’d say most people that are upgrading don’t have the type or previous experience on it but they have experience on other transport category planes.