A twin engine jet lost its door shortly after taking off from Grand Junction Regional Airport. According to a press release from Grand Junction Regional Airport they do not yet know the reason the door fell off of the plane

The Canadair Challenger aircraft left the airport around 3:30 Monday afternoon. It then radioed the airport saying the plane had lost its door.
Just before 4 p.m. the plane landed safely. An airport spokesperson says two pilots were on the plane when the door flew off, they were not injured. No passengers were on the plane.

An FAA website says the aircraft is owned by a corporation based in Snowmass Village. The website says the aircraft was built in 1983 and seats 22 people.

The National Transportation Safety Board has been informed of what happened earlier.

Stay with NBC 11 News for the latest on this developing story.