died in a training mission in 1934. Civilian use returned in 1951 when Northeast Airways resumed flights. The current Manchester airport began to take shape as a joint civil-military facility in the 1960s. A new civilian terminal and the first modern air traffic control tower in New Hampshire were constructed in 1961. Businessman Roscoe A. Ammon donated $500,000 for the construction of the new air terminal. In 1966, the Air Force removed its remaining forces and closed Grenier Air Force Base, leaving the airport open for expansion. In 1978 the airfield was renamed Manchester Airport. Throughout the 1960s and 1970s, the airport was served by Northeast Airlines with the Convair CV-240, Douglas DC-9, and Fokker FH-227. Delta Air Lines absorbed Northeast in 1972 and continued to serve the airport with the DC-9 until 1978, then Boeing 727-200s until 1980 when it discontinued service at Manchester. In the mid-1980s, airlines once again started offering jet service out of Manchester. United Airlines inaugurated service at Manchester in 1983 with two daily flights to Chicago–O'Hare. This was part of their 50 States campaign, which positioned United as the only carrier to serve all 50 states with mainline service. The Boeing 727 and Boeing 737 were initially used on the Chicago flights, which would often make intermediate stops in cities like Providence, Albany, Syracuse, and Burlington to pick up or drop off passengers. Manchester was also a "tag-on" for United flights heading from Bangor and Portland, Maine to Chicago, but the carrier no longer serves either city with mainline aircraft. In the early 1990s, United Airlines began flights between Manchester and Washington Dulles International Airport near Washington, D.C. But creation of a north–south hub at Dulles did not work for United, and heavy competition in this market led to a quick exit. The Boeing 737 was used for this short-lived service, which comprised about four daily circuits between the two airports. US Airways started service at Manchester in early 1986, by connecting their hubs at Pittsburgh and Philadelphia. The carrier used the DC-9, BAC 111, and 737-200 aircraft. Both carriers expanded service at Manchester over the years with larger planes and more flights. United now runs a strict non-stop schedule to and from Chicago with no intermediate stops or tag-ons. The 757 has been used by both United and US Airways at Manchester, which stands as the largest passenger-carrying plane to serve the airport