Originally Posted by WhiskeyDelta

Ok, let’s play this out a little more. How do I know, as a 121 pilot, when my FDP is over? 1 hour after schedule FDP ends? 2, 3, 4?

There appears to be an assumption that FDP will never end except when a pilot reaches his/her max potential FDP.

Note: read the above without regard to any labor contractual language. That’s irrelevant here.

Also, with regard to the assignment to fly a scheduled DH leg, when was the decision made by the company to assign the pilot to work it? Before the FDP originally ended or after the last working leg and just before the DH was supposed to leave? How do pilots receive affirmative intent for no further flying? Should I always be ready to fly beyond my scheduled FDP (assuming no delays and no labor protections)?