Too hot to fly: As temperatures rise, more problems at airports

LOS ANGELES -- More than 40 large wildfires are buring out of control this weekend in at least seven Western states. Many of these fires were sparked by lightning and are now being fueled by triple-digit heat.This summer, we've also seen how extreme heat can impact air travel. Sometimes it's just too hot to fly -- and a new study says it's going to get worse for air travellers. Record-high temperatures grounded dozens of planes in Phoenix, where the mercury approached 120 degrees in late June --