FlyerTalk Forums - Checkin on UA ticket but first flight not UA operated? Who/Where/BPs/Bag allowance?

If on a UA ticket but the first flight is a codeshare and/or partner operated flight, you check-in for boarding pass and bags with the operator of the first flight, not UA. This may mean going to a different terminal.
If doing online check-in, you may need the partner's PNR identifier, Record Locator / PNR of Star Partners on UA purchased Itineraries
Note -- The UA PNR should work for LH Group airlines and some others

Bag allowance can be tricky
-- UA unique elite bag waiver privileges will generally not apply.For *G elites, checking with a *A, your *G bag allowance of

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You can take an extra 20 kg (44 pounds) where the weight concept applies or an extra piece where the piece concept applies.Some airlines do not offer this benefit on individual flights but only on connecting Star Alliance flights. Within Europe on "Light" fares offered by Lufthansa, Austrian & SWISS, "Check&Go" fares offered by Brussels Airlines and “Go light” fares offered by SAS as well as on “Seat” fares offered by Air New Zealand, the extra baggage allowance is not offered.

-- If the original or destination is in the USA, the DoT rules apply. In other cases, the IATA Most Significant Carrier rules apply.

DoT rules state the marketing carrier of the first segment determines the bag fees for the entire itinerary. So if a UA codeshare, it is UA rules. While *A elite benefits may apply, UA unique elite privileges will not

While initially, the UA BP will not show up on the app, it will later. Once the non-UA flights have been flown / boarded (in technical terms, their segment coupons have been lifted.)

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