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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Number 3 - T-100 Reports

Tuesday, November 28, 2017

Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, Alaska Mail Rates
Number 3
Issue Date: November 11, 2003
Effective Date: Immediately


There appears to be some confusion concerning how carriers should report inter-village traffic. In October 2003, the United States Postal Service held five training classes for Alaskan air carriers that report traffic to the Postal Service. The carriers were instructed to report inter-village traffic as if the traffic were enplaned at the bush hub. These instructions only apply to the reports sent to the Postal Service. For T-100 reporting, carriers must report market data for the actual points of enplanement and deplanement. The segment records are reported to show the actual movement of the aircraft.

The Bureau of Transportation Statistics (BTS) performs data validation edit checks on the nonstop segment and on-flight market data submitted by Alaskan carriers in their T-100 reports. The edit process is designed to identify obvious errors that the affected carrier needs to investigate and resubmit corrected data. If the obvious errors are not corrected prior to BTS sending the data to the Postal Service, the edit procedures zero out all market data for airports where the carrier reports more market passengers or freight than segment passengers or freight. The reasoning behind this action is the fact not all passengers and freight leaving an airport are market traffic, because the traffic may have boarded the flight at an up-line point. BTS is unable to determine which markets are in error and, as a result, must rely on the reporting air carrier to make the necessary corrections. BTS, OST and the Postal Service agree that carriers reporting correctly should not be disadvantaged by other carriers overstated market reports.

The same edit procedures can be performed for destination airports, namely market deplanements can not be higher than segment traffic landing at that airport.

In order to lessen the number of report resubmissions, carriers are encouraged to perform these two edits on their own data before submitting T-100 reports to BTS. Please be cautious to perform these edits on an airport basis. The edits may be invalid on a city pair basis. For example if a carrier has a routing from A B C D, the carrier will have A-C and A-D market traffic but no A-C and A-D segment traffic.

This action is taken under authority delegated in 14 CFR Part 385.19(b) of the Departments Organizational Regulations.

Donald W. Bright signature
Donald W. Bright
Assistant Director 
Airline Information