Looking back, I should have worded my previous post a bit differently. Mileage upgrades (irrespective of the status of the upgrader) have priority over regular elite upgrades - in practice, that means that they can clear before or at the same time as EUA's if there are enough seats left for EUAs after the mileage upgrades. Even if your mileage upgrade doesn't clear by the Platinum window, that doesn't mean it won't clear. Keep in mind that you will be ahead of any Platinums with respect to upgrade priority and wait it out. Worse that happens is that the mileage will be redeposited without a redeposit fee and you won't get upgraded.