Originally Posted by njvandy

I believe BXP1 upgrades are treating the same as SWU/miles+copay for these purposes. Up until the day of departure you will need C inventory to open up (or A if you happen to be trying to upgrade a J ticket to F on a transcon).

If it does not clear before the day of departure, you would be added to the upgrade list ahead of elites at the same level of you who are requesting complimentary upgrades. Anyone with a higher status would get higher priority on the upgrade list regardless of upgrade instrument.
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​​There is a master thread on PALL order that may have more information.