U.S. airlines are testing a new secret weapon: passenger segmentation. So far it seems to hit the mark, but executives likely overrate its firepower during bad times. Despite weakness late in the year, U.S. carriers made a lot of money in 2018. They have now enjoyed a rare nine-year run of profitability. Much of the earnings increase at the...

Source: Wall Street Journal February 13, 2019 15:00 UTC