Well, then we agree to disagree. Rather than cancelling at least two trans-Atlantic flights (one in each direction) and messing up the long-planned vacations of hundreds, DL figured out a way to get everybody to where they were going without significant delay. What happened was far better than showing up in the airport at BCN and being told your flight #95 was cancelled due to crew rest rules. Not to mention the flight out of JFK to some European destination that would have been cancelled due to lack of an inbound aircraft!