Originally Posted by
mht_flyer
If it doesn't open up before 24 hours prior to flight, you should then be placed on the upgrade standby list.
I am not sure this is entirely correct. The mileage upgrade
is supposed to clear before T-24 ahead of any EUA.
http://www.flyertalk.com/forum/7374763-post31.html
IME, the mileage upgrade has failed to clear and EUA filled up the F cabin.