CityBird was an airline founded in 1996, and based in Building 117D, Melsbroek Airport in Zaventem. The airline filed for bankruptcy in October 2001. Thomas Cook Airlines Belgium considered buying them out of bankruptcy, but later pulled out.

They flew a fleet of twelve aircraft including the Boeing 767-300ER, various Boeing 737 models (series -300, -400 and -800 aircraft), the Airbus A300-600R and the McDonnell Douglas MD-11. Over 50 European cities were served via Brussels. Citybird employed over 600 employees as of 2001 and was listed at NASDAQ Europe a.k.a. Eastdaq under the ticker symbol CBIR (CityBird holding SA) in November 1997. Though they had bought their first MD-11 in December 1996, they did not begin operations until March 1997.

Their planes offered a "Royal Eagle" business class, "Premium Flamingo" class (not on Newark flights), and "Colibri" economy class. They used the "point-to-point" approach to air travel rather than the "hub and spoke" wherein all transatlantic flights (from Los Angeles, Newark, Oakland, Miami, Orlando or Mexico City) went to Brussels Airport (BRU). All aircraft featured the airline's tagline, "The Flying Dream."

In July 1999, CityBird began cargo activities using two A300-600 "full freighters."

According to the airline's timetable covers, the following destinations in the western hemisphere were served by CityBird from its hub in Brussels:

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