Upvote:0
I found travel insurance to compare prices https://www.check24.de/ This also gives me the option to remove health insurance.
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The cover you are looking for is called Scheduled Airline or End Supplier Failure. This section of cover reimburses any money lost as a result of an airline going into administration or filing for bankruptcy. If you paid for your ticket by credit card, then you would be able to claim the money back that way, although I am fairly sure the card must be yours and not someone else's.
In respect of a specific company who will provide the cover, it depends on where you are travelling from and your destination.