We are unable to prereserve seats on Frontier codeshare flights. Seats will be assigned on Frontier codeshare flights during the check-in process.
You will check in with the carrier on which your flight originates.
Customers originating on Midwest Airlines operated flights connecting to Frontier codeshare flights must check in with Midwest. Customers will be issued a boarding pass for the connecting Frontier codeshare flight and bags will be tagged to the final destination.
Midwest Airlines codeshare customers originating on Frontier operated flights connecting to Midwest Airlines flights must check in with Frontier. Customers will be issued a boarding pass for the connecting Midwest Airlines flight and bags will be tagged to the final destination.