A helicopter is a vehicle appearing in The Sims 2. Prior to The Sims 2: Apartment Life, it only appeared on residential lots as the carpool for the top-level jobs in some careers. Because of the space its rotor takes up, a helicopter cannot land in the normal carpool space, so when serving as a carpool, it occupies space normally used by service NPC's vehicles. A helicopter serving as a carpool cannot land if service vehicles are parked on the street, so a Sim who uses a helicopter as the carpool may not be able to return home until the service Sims have left.
With Apartment Life installed, a Sim can buy a helicopter as a private vehicle. They will also need to buy a helipad, so the helicopter will have a place to land. When parked on a helipad, the helicopter mostly works the same way as a car. Sims can even WooHoo in the helicopter, as they can in a car.
In The Sims 2: Bon Voyage, Sims on vacation can take helicopter tours.
The Sims 3 has yet to include helicopters.
There is also a Helicopter item in the Sims 2 that you can put in a Neighborhood that will spawn and fly in a certain direction.
Reaching the highet of the Military career will grant you carpool in a Helicopter. However unlike other Helicopters the Military Helicopter will be green and have Military icons on it.