[citation needed] Neutral Luxembourg was invaded by Germany on 10 May 1940, and on 21 May the Luftwaffe assigned Jagdgeschwader 53 (JG 53), a Messerschmitt Bf 109 fighter unit, to the airport.

The Ninth Air Force 363d Tactical Reconnaissance Group operated a variety of photo-reconnaissance aircraft until 29 October 1944 when they also moved east into Germany.

[8][9] Sandweiler Airport was used by the Americans for the rest of the war as a transport supply airfield and also to evacuate combat casualties to the UK.

[10] During the late 1960s and 1970s, Icelandair used Findel Airport as their European hub, connecting cities in North America with Europe at Luxembourg.

[citation needed] In March 1999, Luxair launched direct flights to Newark using a Boeing 767,[11][12] terminating them after only seven months of operations.

[21] Actioun Lëtzebuergesch [lb] declared itself to be hugely upset by this new governmental measure, citing that other airports in the world seem to have no problems making public announcements in multiple languages; according to a poll conducted by AL, 92.84% of people in Luxembourg wished to have public announcements to be made in Luxembourgish at Luxembourg Airport.

[77] The airport is due to become the northern terminus of Line 1 of the Luxembourg City tramway, with the extension from Luxexpo scheduled to open on 2 March 2025.

[78] In 2003, the Chamber of Deputies approved then-Minister of Transportation Henri Grethen's project to link the airport to the central train station via Luxexpo by a mostly underground railway connection.

Work began in September 2008, but the project was shelved in 2009 due to budgetary constraints - it was estimated to cost 1.5 billion euros.