in scheduled service. The Airbus A320 series of aircraft is also commonly used by United, Northwest Airlines (merged with Delta Air Lines), and occasionally by US Airways. In April 2010, Delta enhanced service to Manchester; it dropped its daily CRJ-700 service to Atlanta and replaced the aircraft with an MD-88 with seating for 149. Delta also switched all its Delta Connection service to Detroit with mainline service on DC-9's. On October 7, 2021, Spirit Airlines began serving Manchester with the Airbus A320, making it one of 3 airlines regularly serving Manchester with mainline aircraft. Southwest serves Manchester with the Boeing 737-700 and the Boeing 737-800. American flies the Airbus A319/20 from Charlotte. Expansion In 1992, a long-term expansion and improvement plan started to take shape. Two years later, a new terminal designed by HNTB and Lavallee Brensinger opened, providing ample room for larger jets. The airport continued to expand, opening a new parking garage and parking lots in the next years, as well as working to reconstruct the runways and taxiways. In 1998, these expansions paid off, with MetroJet, Northwest, and Southwest all beginning service. The airport prospered from the "Southwest Effect", in which competing airlines increase service and decrease fares to compete with the low-cost carrier. Throughout the 1990s, Manchester outpaced almost every other similarly sized airport in terms of passenger growth. In 2003, Runway 17/35 was extended from to , allowing non-stop service to Las Vegas. In April 2006, the aldermen of the city of Manchester voted to change the name of the airport to "Manchester–Boston Regional Airport" in an effort to increase its visibility to travelers around the country. Decline in passengers In 2006 the airport started to experience a decrease in passengers flying through its facility, with service to only twelve cities. In 2017, the airport served the fewest passengers since 1998. Southwest as of 2021 has diminished service to four cities, with Delta Air Lines serving Atlanta once daily instead of twice. In 2020 they consolidated the service to Boston. United Airlines cancelled their O'Hare service in July 2018, making Newark their only destination from Manchester, which was replaced by Washington Dulles in March 2019. The decline in service is due to increased activity at Logan International Airport in Boston and to mergers between airlines, which led to decreased flights. When Southwest entered Logan in 2009, it also significantly reduced prices at Logan, prompting more