Discussions

Seat selection is available for a fee, with prices varying depending on the seat location and flight duration. Passengers can also choose to upgrade to premium seats, which offer extra legroom and additional amenities. Sun Country Airlines Selection allows passengers to choose their seats during online check-in, at the time of booking or afterward, using the 6-letter Sun Country confirmation code or the code provided by a tour operator.

https://www.airlinesadviser.com/blog/sun-country-seat-selection