Originally Posted by dave_261

There have been several past threads from knowledgeable posters indicating a 2-prong upgrade scenario. Some of this info was verified by Russ Hinckley in last year's chat.

For the EUA:
1. Status level (all plats get upgraded before a gold)
2. Fare Class
3. Time of Purchase

For the battlefield:
1. Status Level
2. Time of check-in

However, perhaps "revenue" would be a better barometer than fare class (although I think they tend to be one and the same).