I was booked on an 11:30am flight from EWR down to PBI tomorrow morning Tuesday Feb 1. I received an email note from CO at 3:45 this afternoon informing me that the flight had been canceled and that I should contact Continental.

The telephone system was overloaded. When I then went to the website to check up on my reservation, the message appeared that the flight has been canceled due to flight irregularity.

What does "flight irregularity" mean? Is it the new way of referring to storms and wx conditions? Could it refer to an mx problem with the aircraft?