Another day, another cancellation of American Airlines AAL54. In August, too. Peak season. Must be booked full or very nearly so. What is going on with this airline? Is the Chicago operation in meltdown? They can expect an appointment with some very uncomplimentary newspaper headlines if any of yesterday's passengers were re-booked on this. Although at this time of year it is likely that AAL55 outbound would have been booked full both days anyway.