Porto OPO to Düsseldorf DUS flight with Ryanair

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.

Malta Air is a low-cost airline that began operations in 2019, initially as a joint venture between Ryanair and the Government of Malta. Ryanair acquired full ownership of the company in 2025. The airline operates from Malta International Airport and has expanded its network to include numerous routes across Europe, the Middle East, and North Africa. Malta Air primarily utilizes Boeing 737-800 and Boeing 737 MAX 200 aircraft, focusing on high-density, short to medium-haul flights. As a low-cost carrier, it offers an Economy Class service with options for purchasing snacks and beverages onboard.

PGA-Portugalia Airlines, also known as PGA, was a regional airline based in Lisbon, Portugal, established in 1988. It began operations in 1990 with an inaugural flight from Lisbon to Porto, initially focusing on domestic routes and limited international charters. PGA expanded its network to include scheduled international flights across Europe and North Africa, serving countries like France, Germany, Italy, Morocco, and Spain. Renowned for its high levels of service, PGA received numerous awards, including \Best European Regional Airline.\" In 2006, TAP Air Portugal Group acquired a majority stake in PGA, making it a regional subsidiary. In 2016, the PGA Portugalia name was retired, and the airline was rebranded as TAP Express, with its fleet replaced by Embraer E190s and ATR 72-600s. As of 2022, PGA Portugalia Airlines was fully integrated into TAP Portugal."