Irregular operations is an airline term for flight
delays,
cancellations, and
diversions, whether caused by
mechanical problems, bad
weather, pilot fatigue, airport runway closings due to
airplane accidents,
congestion, and other miscellaneous factors that airlines must deal with.
Irregular operations are generally stressful for both the airline
staff and the
passengers flying on the airline. The staff find that they need to
reschedule many passengers, and the passengers find that they need to
rearrange hotel plans, business
meetings, and other
transportation factors.