American Airlines is losing money on the part of their business which involves flying people. It turns out that American’s passenger operation would look even worse if it hadn’t been for an accounting rules change (ASC 606) that the airline had to adopt effective January 1, 2018.
The accounting rules change of course may be the best possible way to reflect the costs associated with issuing miles. It also has the effect of moving a quarter billion dollars of passenger revenue out of past years and into the present, making the present look better than it otherwise would have as a result.