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details. >> 431 la guardia has been cut into ground stop. >> reporter: in a summer of extreme heat, torrential rain, and violent storms -- >> we're just looking at these thunderstorms. >> we've got thunderstorms north of houston, around the san antonio area >> how are you >> all right >> have a great day. >> reporter: the nation's airports and airlines have been in the bulls-eye with cancellations running days on end. since memorial day weekend, 343,000 flights delayed. nearly 26% of the total. >> la guardia has entered into a ground stop this is for weather and thunderstorms in the area. >> reporter: in late june, hundreds of thousands of passengers were grounded after violent storms parked over newark and denver for days most affected, united airlines, forced to cancel up to a third of its flights >> it's historically unprecedented at least to have monument-day events. >> reporter: now united's ceo is warning this could b the new normal. >> the regular