Not-So-Friendly Skies! Mama Bear Kourtney Kardashian Lashes Out After Passenger Shushes Her Kids

Mess with Kourtney Kardashian's kids, and more than 10 million people will hear about it.

The 34-year-old reality star, angry after a fellow passenger on a plane told her children Mason and Penelope to cover their mouths, tweeted to her 10.5 million followers Tuesday, "People on airplanes are so wild these days... Telling other people's children to cover their mouths.

"Cover YOUR mouth."

Kourtney was returning from a Mexican vacation at the resort Casa Aramara, where she, her partner Scott Disick, and their kids enjoyed fun and sun.

By the way, don't expect anyone to shush Kourtney's niece North -- and with her dad's temper, that's a very good thing! -- as Kim Kardashian and Kanye West travel via a private jet these days.