How would you like to fly to Australia in Qantas Airways’ luxurious first class on its new Airbus A380 aircraft for $1,200? You could actually buy such a ticket last week, but as regular readers of this column might have guessed, that was yet another case of a mistake fare.

Just like 2009, the new year began with a major airline making an error when filing a fare, and then deciding not to honor the issued tickets. As I wrote last January, Swiss International Air Lines published a $300 business-class fare from Toronto to several European and Indian cities. In November, British Airways filed a $560 round-trip coach fare from the United States to India…