Okay kids, here's something to scratch your heads about. I've discussed it with the schedulers, coordinators, and the scheduling manager is currently looking at this. It is something that may come to a great benefit to you sometime.

Apparently, per the FARs (not contractual), any time that you have a duty day of over 15 hours (>15:01) you automatically drop into compensatory rest, no questions asked.

My situation yesterday:
We ended up flying 9:38 in a 15:38 duty day. Today we were scheduled for approx 6:30 block. We released from duty and were told to report in the AM after 9:00 hours reduced rest, which then rerouting/displacements was changed to 11:30 rest. On the way to the airport, scheduling called and said there was a possible problem with FARs and if we had officially reported, which we had not. Our report was then changed which made a 12:00 comp rest, even though this was only day 2 of the trip. Scheduling explained that any time someone has a duty day of more than 15 hours you cannot have reduced rest and are immediately on comp rest.

Has anyone ever heard of this before?