Delta Air Lines is still grappling with getting their flights back on schedule as delays and cancellations enter the fifth consecutive day. The airline canceled more than 160 flights on Sunday, while more than 1,000 were facing delays, according to the flight-tracking service FlightAware. Between Friday and Saturday, nearly 1,200 flights were canceled in total. Since Wednesday, Delta canceled more than 3,000 flights, forcing thousands of customers to change their travel plans.