He then alerted flight staff to what he was seeing out his window. More @kevindroniak ... we see Droniak talking to the camera in front of an image of the plane's wing with a piece seemingly ...

He then started punching the seat in front of him and the plane window. "He was screaming in multiple languages, punching at the window, lying back, and trying to kick it out," passenger Tanner ...

A window-seat passenger described the plane as skidding on its side and finding himself upside-down. At least 18 people were injured, officials said.