See that AA has some really low fares from HKG to the US (less than half of the fares from SIN where I am based). See plenty of availability for round trip fares from HKG to the west coast for just over 500 USD and east coast for 600 USD and they are generally valid for 1 year travel with very reasonable change fees. For slightly more, there are also options to include legs on CX and JL and the one I am looking to book is HKG-NRT-ORD with HKG-NRT on CX and NRT-ORD on JL. When booking via AA.com, the HKG-NRT shows up with a CX code for some reason (CX524) and NRT-ORD with the codeshare (AA8405).

For SIN-HKG, I intend to make a separate avios award booking on CX. HKG-NRT is on CX524 departing at 0100h and ideally I would have liked to book CX716 that arrives in HKG 2205h which leaves me with a ~3h connection time. This timing is not available though and the other flight is CX636 that arrives at 0010h leaving me with exactly 50 mins for the connection (travelling in a party of 4 and the availability is more limited). This is a legit connection when searching for SIN-NRT options with CX.

Wondering if anyone can advise what are my options for recourse if I miss my connection in this situation with 2 separate PNRs. Will CX rebook me all the way to ORD including the leg on JL given that I am connecting to a CX coded flight or is this a YMMV situation?