The monkey was detected at the airfield area of the airport on February 14 and 18.
The Civil Aviation Authority of Vietnam (CAAV) has urged the airport to closely supervise its camera system in the area where the monkey was spotted and take measures to drive it away.
Noi Bai International Airport
The CAAV has also asked the Hanoi Department of Forest Protection to co-operate with Noi Bai International Airport and Northern Airports Authority to deal with the problem.
The Hanoi Department of Forest Protection needs to instruct agencies which operated at the airport to prepare measures when detecting rare and endangered animals at the airport.
Many flights were hit by birds at airports in Vietnam, causing damage.
