(CNN)--AirTran Airways is adopting its new parent company Southwest Airlines' two-seat policy for passengers it calls "customers of size."
Beginning in March, AirTran Airways will require fliers who can't fit into one seat with both armrests down to purchase a second seat.
On its web site, Southwest says it refunds the additional seat purchase after travel, if the flight was not oversold.
Southwest bought AirTran earlier this year.
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