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Mixed Cabin Itinerary means 1 or more of the flights is in Economy and 1 flight is in Business Class.
So if you were flying Milwaukee – New York – Paris and the ticket said Mixed Cabin, the Milwaukee – New York flight might be in Business Class, and the New York – Paris would be in Economy Class.
It also could be the other way where Milwaukee – New York is in Economy, and New York – Paris is in Business.
Always check which flight is in Business and which is in Economy, because the airline will still charge you Business Class pricing even if the majority of ticket is in Economy.