 And now a look at what is trending this hour. The extreme summer heat is causing problems in the air, but it's probably not what you think. Southwest Airlines says that soda cans are exploding on some of its flights and 20 employees have been injured so far. The airline doesn't stock soda on board, so the cans are exposed to heat as they're loaded onto the planes. Southwest says it's taking measures to stop it from happening, especially in hotter hubs like Phoenix, Dallas and Las Vegas.