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by cracauer 2666 days ago
Here is more info: http://www.ai.mit.edu/courses/6.034f/psets/ps1/airtravel.pdf

It's from 2003, thing got a lot worse since then. The carriers make the rule mechanisms without having mathematicians or computer scientists at hand that watch the combinatorics. They have enough trouble not misfiling fares altogether (aka $0.02 fare NYC->London next Friday).