Could you provide a translation to that sentence, please? Thanks!
Så kræver flykaptajnen dem sat af flyet.

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Then the flight captain will demand that they disembark (literally: "put off the plane").

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Yes, thank you!

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Yes, disembarked like from a ship. A caiptain gives an order, he does not demand, because his word is law onboard. A more correct Danish sentence could be: "Så beordrer flyets kaptajn dem (sat) af flyet", could be what confused you in the first place :)

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Set down as disembark?

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The answer could also be: In that case, the airline captain requires them set down from the plane.