PHILADELPHIA - After a week of widespread disruptions, American Airlines is reducing more than 1800 PHL flights this fall. The airlines are eliminating more than 10% of their scheduled trips nationwide, troubling travelers. On Sunday alone, 34 flights were canceled, and 19 were delayed in Philadelphia. The number of canceled flights is higher than the average for airlines throughout the country and is particularly troublesome for travelers who rely on American Airlines as their main gateway.