#### BACKGROUND
The data contained in the compressed file has been extracted from the DB1BTicket data table of the "Origin and Destination Survey" database from the TranStats data library. The time period is indicated in the name of the compressed file; for example, XXX_XXXXX_2001_1 contains data of the first quarter of the year 2001.
#### RECORD LAYOUT
Below are fields in the order that they appear on the records:
ItinID | Itinerary ID
Coupons | Number of Coupons in the Itinerary
Year | Year
Quarter | Quarter (1-4)
Origin | Origin Airport Code
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.
OriginCountry | Origin Airport, Country
OriginStateFips | Origin Airport, State FIPS
OriginState | Origin Airport, State
OriginStateName | Origin State Name
OriginWac | Origin Airport, World Area Code
RoundTrip | Round Trip Indicator (1=Yes)
OnLine | Single Carrier Indicator (1=Yes)
DollarCred | Dollar Credibility Indicator
FarePerMile | Itinerary Fare Per Miles Flown in Dollars (ItinFare/MilesFlown).
RPCarrier | Reporting Carrier
Passengers | Number of Passengers
ItinFare | Itinerary Fare Per Person
BulkFare | Bulk Fare Indicator (1=Yes)
Distance | Itinerary Distance (Including Ground Transport)
DistanceGroup | Distance Group, in 500 Mile Intervals
MilesFlown | Itinerary Miles Flown (Track Miles)
ItinGeoType | Itinerary Geography Type