A couple weeks ago I booked the following Mini RTW ticket and have a few questions that I'm hoping somebody can help with.

YYC-YWG AC J E90
YWG-YYZ AC J E90
YYZ-LHR AC J 77W (stop)
LHR-BKK TG J 744
BKK-SGN TG J 333
----Open Jaw----
PEK-SFO UA J 744
SFO-YVR UA Y 319
YVR-YYC AC J E90


1. When I booked the ticket the agent was only able to assign seats on AC and said the rest would be assigned at the airport. Entering the ticket locator on UA or TG websites doesn't seem to work. Would calling TG and UA directly be able to solve this problem?

2. I could only get Y on the SFO-YVR segment. Does UA allow standby to J (or even Y+) in this scenario?

3. As I'm arriving in J but departing in Y from SFO will I be able to access the RCC there?

4. Any recommendations for preferred seats on any of the flights listed (I realize there are loads threads on this already but i thought I'd ask anyway).