We have from time-to-time heard, authoritatively, of a SWUs-only at-the-gate for intentional before-- and I assume the policy still is in place (obviously.)
Mike's idea strikes me as an excellent one as the only *possible* defense if ones looking to use miles at the gate.
This was official as of 2006. As to if and how it might have changed since then, unknown:
Quote:
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"..Customers traveling on mileage upgrade awards may not be placed on the airport priority list for an upgrade. They must be confirmed in the upgraded cabin.. [SWU users may still go on said list]"
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