On: Teenager detained at airport after trying to use “skiplagging” trick

[rpearl]

evidently the airline priced that resource at a negative value. (Florida to Charlotte $X, Florida to Charlotte to NY $X-$Y.) so apparently that resource was worse than useless.

[gruez → rpearl]

It's only negative if you think airline's pricing model is something simple like "distance traveled * cost per mile", which isn't the model that airlines with advanced revenue management systems use.

[rpearl → gruez]

From a black box perspective it's easy to conclude that it's negative.