Southwest changed how BS positions are assigned about a year ago. Previously, BS passengers had to check in and were assigned positions based on check-in time. Now, BS positions are automatically assigned sometime between t-36 and t-24, but according to a system known only to Southwest. Much like the order of A-List positions, theories include purchase order and/or "loyalty," re. amount spent with Southwest annually. It is likely that A-Listers receive BS positions ahead of others, but there's nothing written anywhere that verifies any policy.
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