Niki (also styled as NIKI or flyNiki, legally NIKI Luftfahrt GmbH) is an Austrian low-cost airline headquartered in Office Park I at Vienna International Airport in Schwechat. It operates scheduled and charter services to European and North African leisure destinations from Vienna, Salzburg, Graz and Innsbruck and will also start services from several German airports from March 2017.

In 2003 Niki Lauda, ex-Grand Prix driver and founder of Lauda Air, acquired the former Aero Lloyd Austria operation. The airline started operations on 28 November 2003.

Although Niki is often described as "low-cost", it provides full service, such as free refreshments, newspapers and baggage. It offers a sandwich or a cold snack, soft drinks, tea and coffee on all short-haul flights as well as on charter routes to Greece, Tunisia and Turkey. On mid-haul charter flights to the Canary Islands and Egypt all passengers are offered a warm snack. Also, gourmet menus from Demel can be ordered before the flight. There is also a buy on board service.

On 9 January 2004, Niki announced cooperation with Air Berlin. In late 2011, Niki merged completely with Air Berlin, sharing operations, booking systems and aircraft. On 20 March 2012, Niki became an "affiliate member" of Oneworld as a subsidiary company of Air Berlin. Since late 2012, Niki successively repaints their aircraft in the Air Berlin paint scheme, using the Niki logo only at the nose. The new paint scheme was applied during regular C checks.

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