Due to World War II, which was known as The Emergency in Ireland, services were severely restricted at Dublin Airport until late 1945. The only international scheduled routes operated during this time were by Aer Lingus to Liverpool (and for a period to Manchester's Barton Aerodrome). The end of the war meant the beginning of a major expansion in services at the airport. Aer Lingus resumed its London service to Croydon in November 1945. In 1947, KLM started the first European flights to Dublin with a service to Amsterdam. Three new concrete runways were completed in 1948, and in 1950 - after ten years in operation - the airport had welcomed a total of 920,000 passengers.