Time Period
 Year	Year		 
 Quarter	Quarter (1-4)
 Month	Month
 DayofMonth	Day of Month		 
 DayOfWeek	Day of Week
 FlightDate	Flight Date (yyyymmdd)		 
Airline
 Reporting_Airline	Unique Carrier Code. When the same code has been used by multiple carriers, a numeric suffix is used for earlier users, for example, PA, PA(1), PA(2). Use this field for analysis across a range of years.
 DOT_ID_Reporting_Airline	An identification number assigned by US DOT to identify a unique airline (carrier). A unique airline (carrier) is defined as one holding and reporting under the same DOT certificate regardless of its Code, Name, or holding company/corporation.
 IATA_CODE_Reporting_Airline	Code assigned by IATA and commonly used to identify a carrier. As the same code may have been assigned to different carriers over time, the code is not always unique. For analysis, use the Unique Carrier Code.
 Tail_Number	Tail Number		 
 Flight_Number_Reporting_Airline	Flight Number		 
Origin
 OriginAirportID	Origin Airport, Airport ID. An identification number assigned by US DOT to identify a unique airport. Use this field for airport analysis across a range of years because an airport can change its airport code and airport codes can be reused.
 OriginAirportSeqID	Origin Airport, Airport Sequence ID. An identification number assigned by US DOT to identify a unique airport at a given point of time. Airport attributes, such as airport name or coordinates, may change over time.
 OriginCityMarketID	Origin Airport, City Market ID. City Market ID is an identification number assigned by US DOT to identify a city market. Use this field to consolidate airports serving the same city market.
 Origin	Origin Airport
 OriginCityName	Origin Airport, City Name		 
 OriginState	Origin Airport, State Code
 OriginStateFips	Origin Airport, State Fips
 OriginStateName	Origin Airport, State Name		 
 OriginWac	Origin Airport, World Area Code
Destination
 DestAirportID	Destination Airport, Airport ID. An identification number assigned by US DOT to identify a unique airport. Use this field for airport analysis across a range of years because an airport can change its airport code and airport codes can be reused.
 DestAirportSeqID	Destination Airport, Airport Sequence ID. An identification number assigned by US DOT to identify a unique airport at a given point of time. Airport attributes, such as airport name or coordinates, may change over time.
 DestCityMarketID	Destination Airport, City Market ID. City Market ID is an identification number assigned by US DOT to identify a city market. Use this field to consolidate airports serving the same city market.
 Dest	Destination Airport
 DestCityName	Destination Airport, City Name		 
 DestState	Destination Airport, State Code
 DestStateFips	Destination Airport, State Fips
 DestStateName	Destination Airport, State Name		 
 DestWac	Destination Airport, World Area Code
Departure Performance
 CRSDepTime	CRS Departure Time (local time: hhmm)		 
 DepTime	Actual Departure Time (local time: hhmm)		 
 DepDelay	Difference in minutes between scheduled and actual departure time. Early departures show negative numbers.		 
 DepDelayMinutes	Difference in minutes between scheduled and actual departure time. Early departures set to 0.		 
 DepDel15	Departure Delay Indicator, 15 Minutes or More (1=Yes)
 DepartureDelayGroups	Departure Delay intervals, every (15 minutes from <-15 to >180)
 DepTimeBlk	CRS Departure Time Block, Hourly Intervals
 TaxiOut	Taxi Out Time, in Minutes		 
 WheelsOff	Wheels Off Time (local time: hhmm)		 
Arrival Performance
 WheelsOn	Wheels On Time (local time: hhmm)		 
 TaxiIn	Taxi In Time, in Minutes		 
 CRSArrTime	CRS Arrival Time (local time: hhmm)		 
 ArrTime	Actual Arrival Time (local time: hhmm)		 
 ArrDelay	Difference in minutes between scheduled and actual arrival time. Early arrivals show negative numbers.		 
 ArrDelayMinutes	Difference in minutes between scheduled and actual arrival time. Early arrivals set to 0.		 
 ArrDel15	Arrival Delay Indicator, 15 Minutes or More (1=Yes)
 ArrivalDelayGroups	Arrival Delay intervals, every (15-minutes from <-15 to >180)
 ArrTimeBlk	CRS Arrival Time Block, Hourly Intervals
Cancellations and Diversions
 Cancelled	Cancelled Flight Indicator (1=Yes)
 CancellationCode	Specifies The Reason For Cancellation
 Diverted	Diverted Flight Indicator (1=Yes)
Flight Summaries
 CRSElapsedTime	CRS Elapsed Time of Flight, in Minutes		 
 ActualElapsedTime	Elapsed Time of Flight, in Minutes		 
 AirTime	Flight Time, in Minutes		 
 Flights	Number of Flights		 
 Distance	Distance between airports (miles)		 
 DistanceGroup	Distance Intervals, every 250 Miles, for Flight Segment
Cause of Delay (Data starts 6/2003)
 CarrierDelay	Carrier Delay, in Minutes		 
 WeatherDelay	Weather Delay, in Minutes		 
 NASDelay	National Air System Delay, in Minutes		 
 SecurityDelay	Security Delay, in Minutes		 
 LateAircraftDelay	Late Aircraft Delay, in Minutes