Just a friendly reminder... With United, the system does not always automatically catch that your requested mileage upgrade did not clear. I found that United owed me $1650 and 60,000 miles for 3 international upgrades that did not clear. Hopefully this is a systems problem that will get fixed in the very near future. If they can take the money/miles when you request them, they need to be able to refund them when it doesn't clear. This needs to happen automatically without customer involvement.