Originally Posted by
az22
.... 1. If I book this UA flight via Air Canada, will I get to use my 1K benefits? ...
Yes, except you will need to deal with AC for ticket issues and you will not get UA's change policies.
Originally Posted by
az22
....2. Curious, who sets the price on the codeshare tickets? Never have seen such a big price discrepancy before. .....
Codeshares have access to different inventory and if the lower fare class has sold out on UA, you can see this. It will likely readjust soon.