Originally Posted by
star_world
You can get a "choice" seat for free without getting to choose which one (pun intended) by not picking a seat during the booking process if your UA elite number was entered. If you try to change it you'll be charged.
If you don't use OLCI you can choose "select" seats at a kiosk at the airport. Doesn't work if you're already checked in, in my experience.
My experience as well.
Always check in at Kiosk as stated and if exit rows/bulkheads are open usually can switch to one then. Do OLCI and you will not be able to without paying.