Technical problems with airplane and none other available -
Pilot crew not available (i.e. rest requirements and no standby crew available) -
Destination airport unable to receive flight (many reasons) -
Industrial action (strike) by crews, mechanics or airport workers -
Airline (or contractor i.e. travel agent) bankruptcy -
Unsufficient fuel (fuel crisis NOV 1973) -
Airplane accident - i.e. disabled airplane blocks runway at destination -
ATC unable to operate (electrical power failure of entire region) -
Special circumstances (national emergencies 11 SEP 2001) -
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