Question: What type of aircraft can be used in congested or isolated areas and is used at Langley Regional Airport?
Related documents: [0]  [DOC] A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward, and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of VTOL (vertical takeoff and landing) aircraft cannot perform. [END] 
[1]  [DOC] Langley Regional Airport (IATA: YLY, ICAO: CYNJ) is located in Langley Township, British Columbia, Canada. The airport serves mostly general aviation, and also provided scheduled passenger service to the Victoria Airport Water Aerodrome via Harbour Air Seaplanes before service was ended on May 20, 2011. Helicopter operations are a major part of Langley Airport's traffic; the airport has 3 helipads. [END] 
Answer: 
Helicopter
Helicopter