Hi, I am regular traveller to Hanoi so thought it would be nice to pass on an information which might help any one travelliing to Hanoi Vietnam. You could try Noibai Airport Taxi http://www.noibaitaxi.com for Hanoi Airport Taxi Cab Transfer Service. They are very proffesional and good at their service They also provide 20 % discount on all retun journeys . Cheers !!!