Originally Posted by
eigenvector
Any UA agent or self-serve kiosk should be able to do a TOD or E+ purchase. Try at YYZ.
Just call them, they will gladly put you in E+ over the phone. The charges will be exactly the same if you wait until the airport. It should carry over when you check in with AC, but you can always check in for the UA seg on the app before doing OLCI with AC.