Q. Difference Between T-100 Market and T-100 Segment Airline Traffic Data
In market, a passenger is "enplaned" and is counted only once as long as he/she remains on the same flight number. In segment, a passenger is "transported" and is counted for each leg of the trip. Therefore, the numbers in the segment data will tend to be higher than those in the market data (except for international flights). BTS generally uses market data for passenger, freight or mail totals.
For example, 250 people take a flight from JFK (Point A) to BWI (Point B), where 200 passengers deplane and the other 50 passengers, along with 70 additional passengers, continue on to MIA (Point C), where all passengers deplane.
In market, Point A to Point B would be counted as one market of 200 and Point A to Point C would be counted as another market of 50. Point B to Point C would be a market of 70 people.
In segment, Point A to Point B would be counted as one segment of 250 and Point B to Point C would be counted as another segment of 120. A passenger from A to B to C would be counted for both legs.
A to B: 200 Market, 250 Segment
B to C: 70 Market, 120 Segment
A to C: 50 Market (no Segment)
For more information, see the T-100 Traffic Reporting Guide: http://www.bts.gov/programs/airline_information/traffic_reporting_guide/2010/
You can access the T-100 (All Carriers) databases at http://www.transtats.bts.gov/Tables.asp?DB_ID=111&DB_Name=Air%20Carrier%20Statistics%20%28Form%2041%20Traffic%29-%20All%20Carriers&DB_Short_Name=Air%20Carriers
For more information on accessing BTS airline traffic data, Click here.