Here is something to beware of....it has happened to me and others. Booked a deviation ticket, kept the scheduled, did NOT deviate (because I wasn't sure what I was going to do, trying to pick up a trip to turn into). Company never bought a scheduled ticket, probably because the flight was sold out. Called crew schedule when I realized there was no scheduled ticket the day prior when I got a trip, and realized they hadn't issued a scheduled ticket.

Put on hold, finally was told, "We see you have a deviation ticket to your home, therefore you deviated and we didn't buy a scheduled ticket". Fortunately I knew better, and told the scheduler, "I absolutely did not deviate, and according to the contract I can book both. I am taking the scheduled flight". They magically found a ticket, and cut the BS as soon as I called them on it. But what if I was unfamiliar with this? I wonder how many people they have fooled this way.