Klimawandel: TUIfly und Condor in Top Ten des Atmosfair-Index - DER SPIEGEL
Netz & Strecken - Tuifly verlängert Sommerflugplan, Finnair erhöht Frequenzen, Condor fliegt nach New York - airliners.de
Guide to the Largest Major Airlines Flying in Germany
Speculation: Are Condor and Tuifly planning a joint venture? - aeroTELEGRAPH
Emerging from the grey - things are 'heating up' in Dusseldorf in northern winter 2020/21, as Eurowings will have to fend off both TUIfly and Condor on select Caribbean holiday destinations
Tui spricht mit Condor über Ferienflieger
Mit gutem Gewissen fliegen?
File:D-ATYG "TUIfly (Operating for Condor)" (23307252314).jpg - Wikimedia Commons