Maastricht Aachen Airport is a regional airport in Beek in Limburg, Netherlands, located northeast of Maastricht and northwest of Aachen, Germany. It is the second-largest hub for cargo flights in the Netherlands. As of 2016, the airport had a passenger throughput of 176,000 and handled 60,000 tons of cargo. The Maastricht Upper Area Control Centre (MUAC) of the European Organisation for the Safety of Air Navigation (EUROCONTROL) is also located at the airport. History Pre-World War II Plans for an airport in southern Limburg date back as far as 1919, with various locations being considered. Years of debate among various municipalities over the location and funding of the airport delayed its construction. In July 1939 the Limburg provincial government agreed to financially back the airport, however, the start of World War II meant the plans were put on hold once more. Advanced Landing Ground Y-44 After the allied invasion of Normandy, the USAAF Ninth Air Force, specifically the IX Engineer Command, was tasked with constructing temporary airfields close to the advancing front. The area around Maastricht was liberated in 1944. In October 1944, the advance headquarters of the XIX Tactical Air Command and the 84th and 303rd Fighter Wings were moved to Maastricht to keep up with the Ninth Army. Because of the proximity to the new headquarters, the decision was made to create a temporary airfield between the towns of Beek, Geulle and Ulestraten. Several orchards which had suffered damage from a tank battle were commandeered and cleared. Rubble from the nearby town of Geleen, which had been unintentionally bombed in 1942, was used to level the area. The runway was and reinforced with pierced steel planks. The field was built in less than 2 months and was operational on 22 March 1945, and was designated Y-44. The first unit to be based at the field was the 31st Tactical Reconnaissance Squadron, flying the F-6, a reconnaissance version of the P-51 Mustang. The unit arrived on 22 March 1945. As Nazi Germany was rapidly collapsing, the front was already well into Germany by the time the field was ready, and no direct combat sorties were operated from Y-44. 31st TRS was moved to Y-80 near Wiesbaden on 19 April 1945. Units operating at the field 31st Tactical Reconnaissance Squadron, F-6 Mustang (22 March 1945 – 19 April 1945 ) 39th Photographic Reconnaissance Squadron, F-5 Lightning (2 April 1945 –