The 'Before He Cheats' hitmaker often finds herself getting teary eyed at the slightest of things happening during her flying moment, reported Contactmusic.
"I seem to cry a lot on planes when I watch movies. I think it has something to do with the pressure and the funky air. I watched the latest 'Twilight' and I'll admit that I got a little misty," she said.
However, Underwood, 30, does not get embarrassed by her crying as it takes a lot for her to be left red-faced.
"I don't get embarrassed easily. But I was on stage once in Yakima, Washington, and I said Yamaha instead of Yakima. That's the only time I ever messed up. But they laughed, they were with me.