Originally Posted by Dirtdiver

If 117 is the same as 121, FAA doesn't consider you "on duty" until you are at the airport and at the designated time. If Delta catches you before you leave the hotel, you're not on duty. If you show up at the airport early of your own doing (commuter, didn't stay at the hotel, etc.) same thing.

You always have the fatigue card to play, but be careful declaring yourself on duty for FAR purposes. It may not be the same as PWA. Use the contract definitions for contractual rules, FAA definitions for 117 limits.