If your flight is more than 24 hours prior to departure, simply go to the My Trips tab and follow the instructions to access your reservation. You can then click the "Add Bags" link to purchase additional bags. If you selected a Go option, you can go to the My Trips page to upgrade to a travel option that includes bags for your trip.
If your flight is less than 24 hours prior to departure, simply go to the Online Check-in tab and follow the instructions to access your reservation. You can then click the "Add Bags" link to purchase additional bags.
You can always add checked bags at the airport or by calling our Reservations Center.
IMPORTANT: Online check-in closes forty-five minutes prior to the original scheduled departure for domestic flights and one hour prior to the original scheduled departure for international flights.