Southwest Airlines said it canceled over 550 flights on Monday, about 17 percent of its daily schedule, as it prepares for Hurricane Sandy's landfall on the East Coast.
Its subsidiary, AirTran Airways has canceled about 30 percent of its schedule, 180 departures on Monday.
The Dallas-based carrier said it canceled only 58 flights on Sunday evening and 23 flights on AirTran. It added that its operational planners are still evaluating Tuesday's flight schedules which could be impacted by bad weather.
UPDATE: Southwest said on Monday afternon that it has canceled 887 flights from Sunday through midday Wednesday while AirTran has canceled a total of 278 flights from Sunday through midday Wednesday.