Baggage
On codeshare flights, baggage allowances and fees will be determined by the policy of the carrier on which the passenger's flight originates. For example, passengers on a Northwest codeshare flight operated by Midwest will check in with Midwest, and Midwest baggage allowances and fees will apply. Conversely, passengers on a Midwest codeshare flight operated by Northwest will check in with Northwest, and Northwest baggage allowances and fees will apply. Get details at the codeshare carriers' web sites:
Pets
Customers will only pay one fee per direction for their pets to travel with them. (Example: A customer starting their codeshare flight on Midwest will pay Midwest fees outbound, but pay Frontier fees on the return trip.) However, the most restrictive carrier rules apply. Get details at the codeshare carriers' web sites: