Flight cancellations occur when an airline decides to not operate a scheduled flight. This can happen for various reasons, including bad weather, technical issues with the aircraft, or low passenger demand. When a flight is canceled, passengers are typically notified in advance and may be offered alternative travel arrangements or refunds. Airlines often provide compensation for canceled flights, depending on the circumstances and local regulations. Passengers are encouraged to check their flight status regularly and stay informed about their rights. It's also advisable to have travel insurance, which can help cover unexpected costs related to cancellations.