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| Terms | Definitions |
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| USPS Codes | United States Postal Service (USPS) codes for States are used in all American Travel Survey (ATS) data products. The codes are two-character alphabetic abbreviations. These codes are the same as the FIPS two-character alphabetic abbreviations. ( American Travel Survey (ATS) 1995 ) | | Unique Carrier | Unique Carrier Code. It is the Carrier Code most recently used by a carrier. A numeric suffix is used to distinguish duplicate codes, for example, PA, PA (1), PA (2). Use this field to perform analysis of data reported by one and only one carrier. ( Air Carrier Summary Data (Form 41 and 298C Summary Data), Air Carrier Statistics (Form 41 Traffic)- All Carriers, Air Carrier Financial Reports (Form 41 Financial Data), Airline On-Time Performance Data, Aviation Support Tables, Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers ) | | Unique Carrier Entity | Unique Carrier Entity. This field distinguishes entities used by two or more carriers with a numeric suffix, for example, 06038 and 06038 (1). ( Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers, Aviation Support Tables, Air Carrier Financial Reports (Form 41 Financial Data), Air Carrier Statistics (Form 41 Traffic)- All Carriers, Air Carrier Summary Data (Form 41 and 298C Summary Data) ) | | Unique Carrier Name | Unique Carrier Name. It is the name most recently used by a carrier. If two or more carriers have the same most recent name, a numeric suffix is used to distinguish them, for example, Air Caribbean, Air Caribbean (1). ( Air Carrier Financial Reports (Form 41 Financial Data), Air Carrier Summary Data (Form 41 and 298C Summary Data), Air Carrier Statistics (Form 41 Traffic)- All Carriers, Air Carrier Statistics (Form 41 Traffic)- U.S. Carriers, Aviation Support Tables ) | | Urbanized Area | An approximate classification of sample households as belonging to an urbanized area. Those classified as belonging to an urbanized area were either in a central city of an MSA, or in a MSA but outside the central city, and within a zip code area with a population density of at least 500 people per square mile in 1990. ( Nationwide Personal Transportation Survey (NPTS) ) | | Densely settled territory that contains 50,000 or more people. ( Census Transportation Planning Package (CTPP) 1990 ) |
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