Does US honour the MSC's bag fee waivers?
I'm flying ATH-LHR-CLT-PHL-LHR with the first leg on A3 and the rest on US. According to my ticket receipt, A3 is the carrier whose rules determine my baggage allowance, and I get 1x23kg. As an A3*G, I should get an additional 23kg. When I check in at PHL for the return, would US honour that?