Originally Posted by stratidawn

Hello Flyers.. I've got a tricky question here...

I booked two separate tickets: United Airline: SFO -> NRT (First Class Ticket); and within 40min of landing NRT, I will be boarding Shenzhen Airline's NRT --> SZX (Premium Economy)

Condition to be considered:
1. United Airline and Shenzhen Airline are both Star Alliance, I know that I will be able to checked all my luggage through final destination (SZX)
2. These two tickets are purchased separately, ie they are NOT under one itinerary/reservation code.

Here comes the tricky part:
1. SFO --> NRT is first class (longer flight, so UA is considered significant carrier throughout the trip), but NRT-->SZX is premium economy, when I check my bags at SFO, will I be able to check two 70lbs (32kg) luggages all the way through Shenzhen? The question here is that, would the NRT-SZX part of my trip limit my luggage allowance?
2. How does it work if I want to pre-purchase additional checked bags? UA charges $200/piece up to 70lbs per piece. If I do this, would this suffice for the 3rd checked bag to get to the final destination?

I read something about the IATA and the US DOT rules... But wanted to come here and ask you all expert Flyers here.

THANK YOU SO MUCH IN ADVANCE!