Although regional airlines in the United States are often viewed as small, not particularly lucrative "no name" subsidiaries of the mainline airlines, in terms of revenue, many would be designated major airline carrier status based on the only actual definition of "major airline," in the United States, the definition from the U.S. Department of Transportation. This definition is based solely on annual revenue and not on any other criterion such as average aircraft seating capacity, pilot pay, or number of aircraft in the fleet. It is common in the U.S. to incorrectly associate aircraft size with the Department of Transportation's designation of major, national, and regional airline. The only corollary is the Regional Airline Association, an industry trade group, defines "regional airlines" generally as "...operat(ing) short and medium haul scheduled airline service connecting smaller communities with larger cities and connecting hubs. The airlines' fleet primarily consists of 19 to 68 seat turboprops and 30 to 100 seat regional jets." To be clear there is no distinction in the Department of Transportation definition of major, national and regional airlines by aircraft size. The definition is based on revenue. The clash of definitions has led to confusion in the media and the public.