Along the same lines, I have a trip from IAD to SIN, via YYZ and HKG coming up. United is the carrier on IAD to YYZ, CX has us YYZ to HKG.
We are planning to go into Toronto for dinner before CX829 (9 hour layover at YYZ), but not planning to stay overnight.
Can United check our bags all the way through to SIN? Or do the bags have to go through customs with us for our trip out to dinner?