you’re able to pick up open time trips if they fit into your reserve window so if you’re starting a five day block and there’s a three day trip that you like you can pick it up in crew access and scheduling will approve it and you now know what trip you’ll be flying. You can bid PLC (long call) or one of the short call blocks. You can also put in preferences YES or NO for being given trips. This doesn’t hold much weight as there’s other factors that come in prior to them considering that.