Hi, I'm not sure if I should ask here or in United. I'm SE100k, booked a flight from YYC to ORD; AC4026 and AC4027 return. AC won't let me select a seat on the Bookings screen on their website. I don't have a United Mileage account and obviously my flight is booked through AC but flying on United metal (Skywest United Express). So how do I select a seat before check-in date?

I did go on United's website and created an account anyhow. Tried to use their booking page with the AC airline record locator ID and my last name -- no go.

Worth calling AC SE concierge to see if they can help?