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The reason that Condor appears in the OTA and in the GDS is that Condor have agreements with these companies, but MT do not.
Historically, DE was part of the Lufthansa group and often used where LH couldn't be for political reasons. DE operated to Taiwan in place of LH, for example. DE has infrastructure closer to a scheduled airline, but MT has grown out of the UK charter industry and has never sold via GDS's as far as I know.
Exactly well understand the history and presence of the Condor brand and why they should use it for ALL their long haul scheduled offers today and going forward.
Hell there are ongoing but as yet unfounded rummers that Lufthansa Group could be interested in recovering ownership !