I received this overnight :
LX19/01SEP
SWISS FLIGHT INFO -
AT PRESENT WE EXPECT A DELAY OF AT LEAST 100 MINUTES.
WE APOLOGISE FOR THE INCONVENIENCE. REGARDS SWISS
It is strange as the LX18 is scheduled with only 30mn delay ! So it is not because of the late arrival of the aircraft.
I called swiss and asked for a rebooking on LX15 ex JFK it was smooth and easy ^