FlightStats uses several concepts capture the completeness of our flight data. Users will notice fields such as Flights, Tracked Flights, Coverage (Cov) %, and Completion Factor (CF) %. We define these fields as follows:
Flights - The number of scheduled flight operations.
Tracked Flights (Tracked) - The number of flight operations that FlightStats received an actual gate time, cancelation or diversions.
Coverage (Cov) % - The percentage of flights that are tracked.
Completion Factor (CF) % - The percentage of tracked flights that FlightStats received an actual gate arrival time that were not canceled or diverted.