Here's a topic that i searched for but didnt find.
I know that you can book Airtran flights on Southwest. This will give you two free checked bags and will also lower the unacompanied minor age from Airtran's 5-12 to Southwest's 5-11. so if there is a 12 yr old booking on Airtran, they will require the fee, but if booked on Southwest, there is no fee.
What other airline partnerships exist that can help lower the unacompanied minor age?