Originally Posted by xjtguy

Real simple explanation; Say you have a day trip on Monday and have Tuesday off, but would prefer to work Tuesday instead. Monday is showing -1 pilots on reserve, but Tuesday is showing -3 pilots on reserve. The trade will go through because you are lessening reserve coverage on the "worse day". It also works for multi day trips. In the above example, say a 4 day was Mon-Thrs, but you want to shift to a Tue-Fri trip, same thing. As long as Friday has MORE negative reserve coverage than Monday, it'll move the trip. A reserve pilot can use it to move their days off around, with certain restrictions of course. Can't create a single reserve day, etc.