Hi, a silly question possibly, but can I check-in (drop off my luggage) very early eg 10am for the JL86 18:25pm departure to HND 18/03? I arrive into PVG at 09:25am on BA169 (and BA probably won't check me through to HND as flights are unfortunately on separate tickets)...and I hope to pop into Shanghai for a few hours unencumbered!

Many thanks.