You're right.

http://www.suncountry.com/suncountry/terms.jsp

Page 21.


Sun Country Airlines does not currently participate in Inter-Airline ticketing and baggage agreements with any other carrier(s); therefore, no provisions are available for offline accommodations or the acceptance of other airline tickets.

WOW. That's amazing. So if you get stuck and they have no flight until the next day, you are basically out of luck.

If the delay or misconnection is caused by Sun Country Airlines, Sun Country will transport the passenger on its next available flight in the same class or, if unavailable, a higher class of service at no additional cost to the passenger.