Situations like this would be a good reason to create a low-price archive on FT consisting of similar stories: the recent $61 Iceland tickets, the $36 SFO-CDG United flights a year or so ago, etc. That way it would be easy to say, "Here's 5 other cases of seemingly ridiculously low prices, but which nevertheless were honored." I'd actually have two sections, one with intentional low prices, the other where the low prices were (supposedly) a mistake, but honored nevertheless.

Also, as previously pointed out, the big 'gotcha' on incorrect prices is whether a transaction has been completed. With stores, almost all the price corrections are made at time of purchase. Athought there was an intent to purchase (at the lower price), as long as the store didn't actually perform a transaction (sale), they are free to stop it, adjust it, etc. With travel services, on the other hand, the reservation or purchase is typically made at the low price. It's only after the fact that the seller realizes the error, and then tries to change it.

Jeff