Total revenue generated is almost similar for American,Delta and United Airlines.
When it comes to Net Income American airlines is at 4th position, lower than Southwest Airlines which is comparitively half of American
Airlines in terms of revenue.

American Airlines is performing the worst in almost all the areas of profitability.
Southwest airlines is the by far the best performer

American Airlines is the worst performer in terms of Return in Investment.
Southwest Airlines is performing the best.

American Airlines is the worst performer in almost all the KPI's.

American Airlines is visibly under performing in almost all the aspects of KPI.
Saving grace are few KPI's like Liability Assest Ratio, Inventory days, Total Revenue etc.