Table 1 Comparison of Annual Data Coverage,,,
Mode,Improved BTS,NTS,Eno
Air,"Section 401 carriers
Section 418 carriers",Section 401 carriers,"Section 401 carriers
Section 418 carriers"
,,Excludes Section 418 carriers,
,Excludes private carriage and some freight forwarders,Excludes private carriage and some freight forwarders,Excludes private carriage and some freight forwarders
Truck,"Excludes household, retail, service,  government, and certain noncommercial freight shipments",Excludes intracity traffic,Excludes intracity traffic
Railroad,All traffic,Excludes small railroads,All traffic
Water,All domestic traffic,All domestic traffic,"Excludes coastal traffic (including to and from  AK, HI, PR)"
Pipeline,Oil and oil products pipelines,Oil and oil products pipelines,Oil and oil products pipelines
,Natural gas pipelines,,
,Excludes chemical and coal slurry pipelines,"Excludes natural gas, chemical, and coal slurry pipelines","Excludes natural gas, chemical, and coal slurry pipelines"
,,,
,,,