Thousands of passengers at Las Vegas’ Harry Reid International Airport have been hit with flight delays due to extreme heat. Over the weekend, temperatures in the city reached as high as 114 degrees, causing 580 delays, with 284 occurring on Friday. Some planes were too heavy to safely lift off the ground, and so passengers were urged to give up their seats. Harry Reid International Airport, the largest airport in the Silver State, has an average of 489 departures from 31 airlines every day. “The wings aren’t generating as much lift, and the engines aren’t generating enough thrust,” he told the newspaper.