If it were up to me, I'd work a prohibition on 5 day trips into the language of this PBS agreement. The agreement seems to be quite a bit larger than a simple LOA; now would be a perfect time to take 5 day trips out of the equation no matter what regulation comes down the line.
We really have to take some time to think about that one. We also need to be very careful what we ask or wish for. We just may get something with some serious unintended consequences. If this 12 hour rule comes down, we may have painted ourselves into a corner with ANY prohibition on this sort of stuff. There may guys out there that will take something like this and we should not put in things that would make them waive the contract to make more.
Personally, I feel a better rule from the FAA would simply involve limiting a scheduled day to no longer than 12 hours of duty and allow up 16 for IROPS, etc. If the 12 hour duty day comes down, we may be hosed no matter which way we look at it.