Southwest is a great airline. Pay the extra 15.00 for the lower number seating system. well worth it.(I forget what they call it.) If you do not, you may not sit together. Don't know about air tran.
Southwest does not assign seats until check in and assigns them in order of check in by general number. If you pay the few dollars extra you will have a lower number by when you purchase the tickets and more choices on the plane i.e. exit row, first row etc..
It is a little unusual system but actually works great.
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