Oh, I forgot to point out Medium and Long call always get used first, if the trip can be assigned to them in time. For this reason they tend to fly more than short call, which for commuters is obviously better. And they are only awarded an aggressive bid, if no short call wants it.

As far as getting released early on the last day, I have heard it is hit and miss. Some commuters hopefully will answer this better. I doubt seriously it's something you could depend on.