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Rewarding higher fare SOMEHOW: Common.

Rewarding higher spending LINEARLY: Quite a different story.

Full Fare/Business/First Class can often be 5x to 10x the cost of discount economy, yet I know of no airline which reflects THAT BIG a difference in mile or point earning.

The original question of this thread was why not a miles/$ structure. A nonlinear structure that has a few different rates of earning based on rough fare categories is far from a miles/$ structure.

Someone else mentioned Business ExtrAA. AFAICT, that's a credit card, and as such not much different than deals where an airline has a consumer credit card and has you earn EXTRA miles/$ when you charge tickets on said airline with said credit card. But that's IN ADDITION to the miles you earn non-linearly (relative to $ spend) for actually flying.

Actually, its not a credit card, altough it does have a credit card option as a supplement. Basically, the program works by giving you a number of Business ExtrAA points based on how much your fare costs. Any AA itinerary, regardless of how it is purchased, can be eligible. So, yes, the more you pay, the more points you get. The points are separate from miles (although there used to be a way to convert the points to miles). You can also still earn AAdvantage miles at the same time you earn Business ExtrAA points. Now the only thing you can do is earn flights and upgrade awards: https://www.businessextraa.com/apps/...ewAwards.jhtml