Just got the following standard e-mail (I'm plat now)

Dear OnePass Elite Member,

Continental Airlines is pleased to advise you that you have been upgraded
to First Class on your upcoming flight due to your OnePass Elite
Membership.

Confirmation:
Flight Number: 1974
Date: December 21, 2001
Origination: IAH
Destination: MGA
Seat: 02A*

Isn't Central America considered international?