In 2018, Utah-based SkyWest Airlines was the regional airline with the highest added number of commercial aircraft. In that year, 44 more aircraft were added to their fleet additionally, their fleet size number had increased from 595 operating aircraft in 2017 to 596 the following year. In 2019, the projected number of regional carrier aircraft in the U.S. commercial aircraft fleet is expected to be around 2,187 aircraft.
Regional airlines usually operate either as an affiliated airline, under contract with a major airline or under its own brand as an independent airline serving smaller areas. Some of the other leading regional airlines in the U.S. include: Envoy Air, PSA Airlines and MESA Airlines. In 2018 , the total number of passengers carried by Envoy Air amounted to about 13.64 million passengers and accounted for the largest system cost per available seat mile in 2016. Envoy Air is currently a subsidiary of American Airlines Group.
Founded in 1975, the Regional Airline Association (RAA) is the official collective bargaining voice for regional airlines nationwide. Some of the leading regional aircraft manufacturers worldwide include: Embraer, Bombardier, ATR, Sukhoi, and Bombardier. Hawaiian Airlines was ranked the number one most punctual regional airline in December 2018.