Originally Posted by sweptback

You are factually incorrect.

I can only speak to the domestic operation because that is all I fly. A UAL pilot that is reassigned to arrive later than his/her scheduled arrival time will receive 50% add pay on all the extra flying. If that flying takes the pilot into a new calendar day, the pilot gets an additional 50% add pay for any flying on the next calendar day. There are mechanisms to get the day off restored for lineholders, but there are contractural glitches that need to be fixed in a new agreement. Reserves always receive their day off back because they are at min days off, but do not have a choice of the day like lineholders do (it's their next reserve day which becomes an off day). Reserves also do not receive the 50% late pay but do receive the 50% day off pay.

There is no such thing as being junior manned at UAL. The crew desk cannot just call you and force you to come to work. If you are flying on an off day that means you had been reassigned or had a maintenance issue.