e3fc0434_anced_seat_selection___Gadling__Premium_Services
[0] US Air [Earliest available] During on line check in [Charge?] No [Can you pre book an exit row?] Request at check in [Premium Services] 
Some aisle and front of plane seats $5-$20, buy online from 24 hours in advance
Once a free perk, many airlines now charge for advanced seat selection - Gadling
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