A Delta Airlines flight from Detroit landed safely at Denver International Airport on Monday after a midflight mechanical issue damaged the plane’s nose. An Airbus A320 was carrying 148 passengers and six crew members when the crew received a notification about a mechanical issue,

DENVER (KDVR) — On Monday afternoon, Delta flight 1648 from Detroit to Denver landed at the Denver International Airport without incident. After deplaning, one passenger stopped and looked out the window at the aircraft she had just arrived on.

Delta is working to figure out how one of its planes suffered nose damage. The discovery was made when the flight landed in Denver after leaving Detroit.

She posted a picture on social media of the front end of the plane which appeared to be dented, almost like it hit something mid-flight, since Bennett said it wasn’t there when they flew out of Detroit more than three hours earlier.

After deplaning, one passenger stopped and looked out the window at the aircraft she had just come in on. “It was kind of a shock. We looked over and that’s what we saw and nobody’s kind of been able to figure out what it is,