Originally Posted by
bocastephen
You will need to use EVA's miles, or use a *A upgrade award from Y or B fare classes ahead of time. There are no known at-airport upgrades, paid or otherwise. In the event of an oversale, their own Elite customers will be op-up'd.
its still possible to upgrade at the airport. My mom in Nov 2015 asked to upgrade(T-->Z?) at LAX using 35k EVA miles. They gave it to her instantly...