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The article mentions that he might have been in Kiel, Germany recently.

And getting into the non-Schengen area via another flight would require a proper passport and visa as the flight would originate in a non-Schengen country.

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Or he might have been going to Kiel, and came in from an non-Schengen origin to catch a connecting flight in Copenhagen to Kiel.

But flying from say the UK to Denmark would require him to have a passport and a visa (checked in the UK).

More likely he flew from Israel to Denmark given his documents, but when he said he left his passport on the plane, it might have been the first plane.

Kiel has a tiny airport that doesn't have any scheduled services, but they have a large port with ferry and cruise terminals.

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