Three separate plane crashes occurred during the long Labor Day Weekend in North Carolina, Colorado and Oregon, killing at least nine people, the National Transportation Safety Board revealed Monday.

Three people died Monday in North Carolina when a Beechcraft A36 crashed in Forsyth County, two people died Monday in Oregon when a two-seater crashed near an airport, and at least four people died Sunday in Colorado when a Cessna 310 went down in a remote part of the San Juan mountains, reported the NTSB, according to the International Business Times.

The Beechcraft A36 crashed near a rock quarry while on its way to Greensboro, N.C. The plane had taken off from Sarasota, Fla. and was six miles away from its destination when the pilot allegedly became disoriented and lost his way, reported CNN. NTSB spokesman Peter Knudson said the pilot had contacted air traffic control for help, and even though officials tried to steer the pilot to the airport, it was to no avail and the plane went down.

The NTSB will arrive at the crash site Tuesday to investigate.

The Cessna 310 was on it's way to Amarillo, Texas from Flagstaff, Ariz. when it inexplicably crashed north of Silverton in the San Juan Mountains, reported Fox News. Flight control was tipped off about the incident when a concerned relative of one of the passengers reported the flight overdue, FAA spokesman Ian Gregor revealed.

A search and rescue team from the San Juan County Sheriff's Department was used to locate the crash site and recover the bodies. Furthermore, the NTSB and FAA arrived at the crash site Monday evening to investigate.

The two-seater crashed into a field near an airport in Creswell, Ore., at around 10 a.m. Authorities were promptly notified and arrived to find the plane on fire, as well as the two passengers inside already dead, according to Lake County Sheriff's Office Lt. Chris Doyle.

In all three cases, the names of the deceased are still unknown to the public, the investigations are ongoing.