Yes, when you get to the exalted (or whatever they call it) level of frequent flyer, you can upgrade on international trips from any paid fare. Till you reach that stratosphere, you'll have to pay more for your purchased ticket in order to upgrade.

Be looking for changes in redemption levels for free/upgraded trips. The airlines really are putting the squeeze on their former largesse. Rules appear to be made up on the moment, so I always recommend a second call to the frequent flyer reservation desk to see if you get the same answer twice.

Gail In Eugene