Attributes
----------

DATE|datetime|date of flight departure
DAY_OF_WEEK|categorical|day of the week
FLIGHT_NUMBER|string|ID number of flight
TAIL_NUMBER|string|ID number of aircraft
SCHEDULED_DEPARTURE_HOUR|numeric|hour of flight departure
SCHEDULED_TIME|numeric|duration of scheduled trip (in minutes)
ELAPSED_TIME|numeric|duration of actual trip (in minutes)
DEPARTURE_DELAY|numeric|delay for departure (in minutes)
ARRIVAL_DELAY|numeric|delay for arrival (in minutes)
CANCELLED|categorical|status of flight cancellation
CANCELLATION_REASON|categorical|reason for flight cancellation
AIR_SYSTEM_DELAY|numeric|delay caused by air system (in minutes)
SECURITY_DELAY|numeric|delay caused by security (in minutes)
AIRLINE_DELAY|numeric|delay caused by airline (in minutes)
LATE_AIRCRAFT_DELAY|numeric|delay caused by late aircarft (in minutes)
WEATHER_DELAY|numeric|delay caused by weather (in minutes)


Entities
--------
AIRLINE|airline company
ORIGIN_AIRPORT|airport of origin
DESTINATION_AIRPORT|airport of destination
