The Waikato Westpac Rescue Helicopter was dispatched to a bus that had gone over a bank near National Park on Sunday 15 January.
There where reported 15 patients, with approximately six patients being transported to hospital.
Also in attendance was the Greenlea Rescue Helicopter and the Palmerston North Rescue Helicopter.
The rescue helicopters meet road ambulances near the incident, due to poor weather conditions, making landing at the scene difficult.
One patient was flown via the Greenlea Rescue Helicopter to Taupo Airport and was then transported by the Westpac Air Ambulance to Waikato Hospital.