Originally Posted by
flyguy81
You can do as little or as much as you want.
Correction. You can do as much as you want. You cannot drop a trip unless another pilot is willing to pick it up. You can trade with the company for another trip with equal or greater duty periods too. And under extremely rare circumstances - like Haleys Comet or Bigfoot sighting - you can trade with the company for a trip with fewer duty periods. Gotta be really quick though.
Minor clarification in case you happen to be coming from an airline that allows drops. Getting rid of flying as a junior pilot here is challenging to say the least.