friday. cnn aviation correspondent pete munteen has our report. >> reporter: the truth is no airline is immune to these cascading issues. now it is american airlines which canceled more than 800 flights on sunday, more than 500 on saturday, more than 300 on sunday. that means 1 in every 10 flights over that period was canceled. but american says this really all started on thursday when high winds and bad weather hit its main hub at dallas fort worth that kicked off a chain reaction of cancellations leaving planes and crews out of position. the ceo sent a letter to the entire airline saying he wanted to build certainty into the operation so the airline proactively began canceling flights. but that left thousands of passengers stranded in long lines across the country. >> i don't understand why it's canceled. i heard they didn't have enough staff. well, you sold me a product.