I am currently holding a RTW ticket with the following legs:

ORD-PVG (UA)-Stopover
SHA-PEK-NKG (CA)- Stopover
NKG-FRA (LH)
FRA-IAD-DEN (UA)- Stopover
DEN-ORD

My question is if I decided not to take the Air China flights (SHA-PEK-NKG), would it cause any issues with the other flights. I scheduled these flights to get the second stopover in NKG, and I would prefer to just take the train from Shanghai rather than spend 7-8 hours flying.

Thanks!