Q. Why does TranStats have missing Service Classes in Schedules T-1 and T-2?


  • Service classes K, V, and Z were removed from Schedules T-1 and T-2 in the Air Carrier Summary Data because they were duplicates of other services classes. This duplication was causing confusion and misuse of the data.

  • The Z class in T-2 was restored because the fuel consumption data was linked to that class.

  • Since there was no similar situation with T-1, those classes were omitted.

  • You can add the remaining service classes to get the totals:

    • K = F+G, V = L+N+P+R, and Z = K+V

Questions? Contact The Bureau of Transportation Statistics (BTS)

  • Phone Toll-free: (800) 853-1351

  • Phone Local: (202) 366-DATA (3282)

  • Mail:

National Transportation Library
Office of the Assistant Secretary for Research and Technology
U.S. Department of Transportation
1200 New Jersey Avenue, SE
Washington, DC 20590


  • Last Updated Aug 07, 2017
  • Views 4
  • Answered By David Martin

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