Southwest Airlines confirms it is weighing a purchase of Boeing 737-800 aircraft, a larger model that would help the discount carrier offer more seats at airports where slot controls make it difficult to add flights. Southwest currently has orders on the books for new 737-700 aircraft configured to seat 137 passengers, but it may seek to negotiate an upgrade to the 800 model configured for 175 seats. Boeing appears willing to allow the change, but the airline must also win approval from unions representing pilots and flight attendants.

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