YEAR	Year
QUARTER	Quarter (1-4)
MONTH	Month
DAY_OF_MONTH	Day of Month
DAY_OF_WEEK	Day of Week
FL_DATE	Flight Date (yyyymmdd)
OP_UNIQUE_CARRIER	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.
OP_CARRIER_AIRLINE_ID	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.
OP_CARRIER	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_NUM	Tail Number
OP_CARRIER_fL_NUM	Flight Number
ORIGIN_AIRPORT_ID	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.
ORIGIN_AIRPORT_SEQ_ID	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.
ORIGIN_CITY_MARKET_ID	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
ORIGIN_CITY_NAME	Origin Airport, City Name
ORIGIN_STATE_ABR	Origin Airport, State Code
ORIGIN_STATE_fIPS	Origin Airport, State Fips
ORIGIN_STATE_NM	Origin Airport, State Name
ORIGIN_WAC	Origin Airport, World Area Code
DEST_AIRPORT_ID	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.
DEST_AIRPORT_SEQ_ID	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.
DEST_CITY_MARKET_ID	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
DEST_CITY_NAME	Destination Airport, City Name
DEST_STATE_ABR	Destination Airport, State Code
DEST_STATE_fIPS	Destination Airport, State Fips
DEST_STATE_NM	Destination Airport, State Name
DEST_WAC	Destination Airport, World Area Code
CRS_DEP_TIME	CRS Departure Time (local time: hhmm)
DEP_TIME	Actual Departure Time (local time: hhmm)
DEP_DELAY	Difference in minutes between scheduled and actual departure time. Early departures show negative numbers.
DEP_DELAY_NEW	Difference in minutes between scheduled and actual departure time. Early departures set to 0.
DEP_DEL15	Departure Delay Indicator, 15 Minutes or More (1=Yes)
DEP_DELAY_GROUP	Departure Delay intervals, every (15 minutes from <-15 to >180)
DEP_TIME_BLK	CRS Departure Time Block, Hourly Intervals
TAXI_OUT	Taxi Out Time, in Minutes
WHEELS_OFF	Wheels Off Time (local time: hhmm)
WHEELS_ON	Wheels On Time (local time: hhmm)
TAXI_IN	Taxi In Time, in Minutes
CRS_ARR_TIME	CRS Arrival Time (local time: hhmm)
ARR_TIME	Actual Arrival Time (local time: hhmm)
ARR_DELAY	Difference in minutes between scheduled and actual arrival time. Early arrivals show negative numbers.
ARR_DELAY_NEW	Difference in minutes between scheduled and actual arrival time. Early arrivals set to 0.
ARR_DEL15	Arrival Delay Indicator, 15 Minutes or More (1=Yes)
ARR_DELAY_GROUP	Arrival Delay intervals, every (15-minutes from <-15 to >180)
ARR_TIME_BLK	CRS Arrival Time Block, Hourly Intervals
CANCELLED	Cancelled Flight Indicator (1=Yes)
CANCELLATION_CODE	Specifies The Reason For Cancellation
DIVERTED	Diverted Flight Indicator (1=Yes)
CRS_ELAPSED_TIME	CRS Elapsed Time of Flight, in Minutes
ACTUAL_ELAPSED_TIME	Elapsed Time of Flight, in Minutes
AIR_TIME	Flight Time, in Minutes
FLIGHT	Number of Flight
DISTANCE	Distance between airports (miles)
DISTANCE_GROUP	Distance Intervals, every 250 Miles, for Flight Segment
CARRIER_DELAY	Carrier Delay, in Minutes
WEATHER_DELAY	Weather Delay, in Minutes
NAS_DELAY	National Air System Delay, in Minutes
SECURITY_DELAY	Security Delay, in Minutes
LATE_AIRCRAFT_DELAY	Late Aircraft Delay, in Minutes