"Upgrading" from Gold to Platinum challenge
This information may be useful to some:
I signed my wife up for the Gold challenge this morning. She's flying MIA-LHR-AMS on Friday, then AMS-LHR-JFK-MIA with me on the 18th/19th. The trip should net her about 7000 EQP and I'm planning a west coast trip sometime in February/March so I asked if it were possible to "upgrade" to the Platinum level if she completed 10000 EQP in the challenge period. The answer (after checking, and from an AA CS supervisor), was a definitive yes, however the additional fee is now $100, not simply the difference between the two different challenge fees.