[PHXFlyer]

I attempted to duplicate the itinerary on Air Berlin's website. It is impossible to purchase one ticket from JFK to Moscow. The Dusseldorf-Moscow portion of the ticket must have been purchased separately unless the ticket was purchased from a travel agent.

Regardless it doesn't matter. No matter what the ultimate destination is if there's a segment that is entirely within Europe then the baggage rule for an intra-european flight would apply. Why would you tell one person traveling from Moscow to Dusseldorf they have a different baggage allowance from another person simply because in several days they are ultimately traveling trans-Atlantic? If you're not connecting you're an O&D passenger just like everyone else.

(O&D mans Origination-Destination...yes it's an "airline" term...one I learned on FlyerTalk. Gawd do I have to defend myself at every turn? YES I GUESS SO!)