Originally Posted by
physicsdude
This is a very stupid question but I'm dumb. Basically, I need to head to SFO but it's cheaper to fly out west when I fly through YYZ where the plan is to fly LGA-YYZ and then YYZ-SFO with AC on separate itineraries. I know that I'll have to clear TSA and US customs again but is this allowed and is this worth the risk of saving hundreds of dollars?
It is not prohibited, but AC will not through check your baggage and will not be responsible for a misconnection.
And I am surprised you actually can save money this way. I always want to do self connection at YYZ with AC for US transcontinental trip but it is usually much more expensive than just flying UA.