located near Harrisburg, Pennsylvania. British Prime Minister Winston Churchill departed from "Baltimore Municipal Airport" on a 1942 British Overseas Airways Company (BOAC) flight (today it is "British Airways") after visiting President Franklin D. Roosevelt in what was at first, a secret trip to the White House in Washington, D.C. during the Christmas season for Allied consultations shortly after America entered the War following the Japanese sneak bombing raid at Pearl Harbor, in Hawaii on Sunday, December 7, 1941, and later in the Philippines at other American air and naval bases. The Prime Minister later met with reporters and addressed an unprecedented joint session of the United States Congress at The Capitol. BOAC continued to use Harbor Field as its main U.S. Operating Base during the war. BOAC "flying boat" service to Baltimore Municipal Airport ended in 1948. Civil airline service returned to "Baltimore Municipal Airport" in 1946. The airport's runways were not long and were limited to smaller planes. When Friendship International Airport (later Baltimore-Washington International Airport) opened in 1950, near Linthicum in suburban northern Anne Arundel County, airlines almost immediately moved to the new airport, which would later handle transcontinental jetliners. "Baltimore Municipal Airport" was officially renamed "Harbor Field" in 1950. During the 1950s "Baltimore Harbor Field" continued to serve private pilots and business aviation. It was also used as a Maryland Air National Guard (MDANG) base after the war. Beginning in 1946, the MDANG based its 104th Fighter Squadron at the airport. The squadron was originally equipped with piston-powered P-47 Thunderbolt aircraft, later replaced by F-51 Mustangs, but eventually the unit converted to the jet-powered F-86 Sabre. In 1957, the 104th relocated to the Glenn L. Martin Company Airport, of the former aircraft manufacturer Glenn L. Martin Company further to the east along Eastern Avenue in Middle River whose longer runways was necessary to support jet operations. In addition, the Maryland Air National Guard's 135th Air Commando Group was based at Harbor Field from 1955 until 1960, when it too relocated to the Martin Company Airport. That unit flew twin-engine C-46 Commando and SA-16 Albatross aircraft. In 1958 the airport was purchased by the recently constituted, old Maryland Port Authority of the State of Maryland for conversion into a marine terminal for port and maritime business and shipping, ending the use of the facility as an airport. The airfield was officially closed on 30 December 1960, following the