Porto OPO to Bucharest BUH flight with TAROM

KLM Cityhopper is the regional airline subsidiary of KLM Royal Dutch Airlines, headquartered in Haarlemmermeer, Netherlands, and based at Amsterdam Airport Schiphol. Established in 1991 from the merger of NLM CityHopper and Netherlines, it operates scheduled European feeder services on behalf of KLM, connecting smaller cities and regional airports to KLM's main hub. As an affiliate of SkyTeam, KLM Cityhopper operates a fleet primarily consisting of Embraer E-Jet aircraft, including the Embraer 175, 190, and E195-E2 models. It serves numerous inter-European destinations, playing a vital role in KLM's regional and international network.

Dan-Air was a British airline established in 1953 as a subsidiary of Davies and Newman, a London-based shipbroking firm. It began with a single aircraft and initially focused on cargo and passenger charter flights. Over its 39-year history, Dan-Air expanded significantly, becoming Britain's largest independent airline by the mid-1970s in terms of passengers and fleet size. The airline was an early adopter of jet aircraft in Britain, introducing de Havilland Comet jets in 1966 and becoming the first British operator of the Boeing 727 trijet in 1973. Dan-Air operated a diverse fleet for inclusive tour charters, scheduled services, and oil industry support flights, with hubs including London Gatwick and Berlin–Tegel. Facing financial difficulties, Dan-Air ceased operations in 1992 and was acquired by British Airways.