Perhaps they have, albeit in a roundabout way: none work for my admittedly small random sampling of AA flights to San Diego, Los Angeles, San Francisco and Seattle, all within prescribed time limits and applicable fare classes (when shown) - each time returning results of either "fare code does not exist" or "fare code does not apply."

The one I could read conditions for was 5% off - saving me about the price of
the food I'd buy at the gate on a discounted coach ticket on these routes. Hardly worth the bother, not to mention the moral discomfort.