Originally Posted by pinniped

Chronic complainers get cut off eventually: they have systems in place to control for that.

It's also their systems that issue the alleged "mistake" fares. Strong emphasis on alleged... If I book a fare that they issue, why is that my problem? If they make 11 seats available in a given fare bucket and I book them all, why is that a problem?

If that kind of customer isn't good for an airline, stop issuing those fares. The airlines themselves completely own and control their systems and their QA processes.

For what it's worth, I can understand how any airline's first mistake fare was an actual mistake. Subsequent "mistakes" are a conscious cost-benefit decision to undertest the applications or fail to alter known system features. That's okay, as long as they then behave honorably in the marketplace when they issue these fares.