Originally Posted by
Fanjet
If one misses the PHL-ZRH flight, they can be put on the later flights to LHR from PHL that day, and then onto LHR-ZRH.
So then I'd have flown: JFK-
PHL-LHR*-ZRH, originally (before the NYC market "downgrade") JFK-ZRH (#64, non-stop) to a 2 stop

*Assuming there are open seats.