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Sorry if this seems like a "no-brainer" to some of you, but if you hold a reserve line and have four days on and you get called in on the 4th day, can you only fly a trip that day or could it carry over to your off day(s)??
[/ QUOTE ]Doug says it could be either way....he says it's different for each airline (which is why he hasn't written a section about it since he only knows delta specific) but they could call you in for one longer trip or just a day trip...