Lufthansa CityLine GmbH is a German airline with its headquarters on the grounds of Munich Airport. It is a wholly owned subsidiary of Lufthansa and maintains hubs at Frankfurt Airport and Munich Airport, from where it operates a dense domestic and European network as a member of Lufthansa Regional. Since October 2015, it also operates some long-haul routes on behalf of its parent company.

The airline was founded as Ostfriesische Lufttaxi (OLT) in 1958 and became Ostfriesische Lufttransport (OLT) in 1970 - which existed until 2013 as a separate airline - in Emden. It was reorganised and renamed as DLT Luftverkehrsgesellschaft mbH on 1 October 1974 and began cooperation with Lufthansa in 1978 with short-range international routes.

By 1988 all operations were on behalf of Lufthansa. In March 1992 DLT became a wholly owned subsidiary of Lufthansa and was renamed Lufthansa CityLine. Lufthansa CityLine employs 2,332 people, of whom 664 are cockpit crew, 849 cabin crew and 819 work in the technical and administrative areas as of 31 December 2011.

Lufthansa placed an order on 17 April 2007 for 30 Embraer E-190/195 and 15 Bombardier CRJ-900 aircraft to directly replace LH CityLine's fleet of BAe 146 and Avro RJ aircraft. The last Avro RJ 85 took off from Cologne Bonn Airport on August 27, 2012 as LH1985.

The airline was previously headquartered at Cologne Bonn Airport. In May 2013 it was announced that the management and administration offices of CityLine will be relocated from Cologne to Munich. The move was completed as of September 2014. Its corporate headquarters are now at the Flight Operations Center (FOC) at Munich Airport.

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