What types of flight delays are reported to BTS by the airlines?
Airlines that report monthly numbers of flight delays to the BTS began reporting information on causes of delays in June 2003. The airlines report the causes of delays in five broad categories: • Air Carrier: The cause of the cancellation or delay was due to circumstances within the airline’s control (e.g. maintenance or crew problems, aircraft cleaning, baggage loading, fueling, etc.). • Extreme Weather: Significant meteorological conditions (actual or forecasted) that, in the judgment of the carrier, delays or prevents the operation of a flight (e.g. tornado, blizzard, hurricane, etc.). • National Aviation System (NAS): Delays and cancellations attributable to the national aviation system that refer to a broad set of conditions non-extreme weather conditions, airport operations, heavy traffic volume, air traffic control, etc. • Late-arriving aircraft: A previous flight with same aircraft arrived late, causing the present flight to depart late. • Security: Delays or cancellations caus
