Frankly, I never assume that uniquely good fares are mistakes.

There are often some outstanding fares that are run as promos - sometimes to cut a competitor's throat, and other times just because business is really light on a route. Maybe a route is being introduced, or trying to be saved... or maybe an airline is even looking for some good cheap PR.

Remember the 9/11 $1 fares? Those were no mistake. The media surrounding them was worth fare more than the lost fares.

So don't ever just assume or 'know' that you're found an error.

When you find a uniquely good deal -- and here I mean fares like what you cite, like the $150 MX business fare from the US to several Mexican destinations, the $55 DEN-FRA fare, the $29 Paris fares, etc. -- I recommend that you:

• Buy it.
• Buy it again.
• And if, in the case of the MX full fare C deal, the ticket is refundable -- buy about 10 more.
• Post it in the airline's forum here on Flyertalk
• Link to that post in Mileage Run and Miles Buzz

Your fellow Flyertalkers will thank you. I will thank you.

Best,
Gary

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View from the Wing: A blog about Free Miles and Free Markets