Originally Posted by
LyingFlat
Provided all flights are on the one ticket, UA rules apply for the whole itinerary.
US DOT requires that the baggage allowance for ex-US itineraries is whatever the allowance is of the first "marketing carrier."
If OP was booked as ORD-(LX)-ZRH then LX allowance applies. If it was EWR-(UA)-ORD-(LX)-ZRH then UA international allowance applies.
So given the flight codes I posted, who is the marketing carrier? My understanding is that since the ticket is beginning in 016 and the first leg is on a UA flight code, the marketing carrier is United but I am unclear.