 According to tracking website flightaware.com, more than 1,500 U.S. flights were canceled yesterday and more than 8,500 were delayed. Upwards of 1,000 of the cancellations were from Delta. The airline paused all travel for unaccompanied minors until Wednesday as they worked to figure out how to get back up and working smoothly. Delta and other carriers are still trying to recover their systems and restore operations.