Redigera svaret enligt @Amin:
KLM har ingen skyldighet att lämna dig ombord med ett utgått pass.
Per deras Allmänna transportvillkor (betona min)
ARTICLE 9: REFUSAL AND LIMITATION ON CARRIAGE
The Carrier may refuse to transport Passengers and their Baggage, if one or more of the following cases has occurred or is likely to occur:
[...]
(k) The Passenger does not appear to be in possession of valid travel documents, may seek or has sought to illegally enter a country through which he may be in transit, or for which he does not have a valid entry document, has destroyed travel documents during the flight, has refused to allow copies thereof to be made and kept by the Carrier, or the Passenger’s travel documents have expired, are incomplete in light of the regulations in force, or appear to be fraudulent or otherwise suspicious (for example: identity theft, forgery or counterfeiting of documents).[...]
18.2 Travel Documents
[...]
(b) The Carrier reserves the right, in accordance with Article 9, to refuse the Carriage if a Passenger fails to comply with the applicable laws and regulations, if the Carrier has doubts as to the validity of the documents presented, or the Passenger does not permit the Carrier to take and retain copies of any documents or otherwise retain data contained in the relevant documents.
Jag tweeted dem och deras svar var snabbt & rensa:
We will only accept passengers travelling with a valid travel document. An expired passport is not valid anymore.
För att vara på den säkra sidan rekommenderar jag att du kontaktar din närmaste ambassad och försöker få ett nytt pass eller ett resehandlingar.
Men de kan tydligen låta dig gå ombord efter eget gottfinnande.