Airline cancellations can occur for a variety of reasons, e.g.: weather-related, mechanical issues, or overbooking. Airlines may cancel flights if weather conditions may impede safety, or if a machine or part needs immediate attention. Overbooking, when too many tickets have been sold for the amount of available seats on a flight, can also result in cancellations. It is important to check the weather before travel and to monitor flight updates from the airlines for potential cancellations.