Kent, Surrey and Sussex Air Ambulance is the first to launch a 24-hour service, which will include night flights.
The charity will operate a Helicopter Emergency Medical Service from today across our region.
The Kent, Surrey and Sussex Air Ambulance Trust's state of the art helicopter operates every day of the year to save lives across our region and is capable of flying to a medical scene in less than 20 minutes.
The aircrafts allow the service to work closely with South East Coast Ambulance Service, responding to more than 1500 emergency calls every year.
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A further 85 buses are expected to arrive on Tuesday and Wednesday, with officials saying the entire operation will last at least a week.
The government will make an announcement about whether Heathrow or Gatwick should be awarded a new runway at 12.30pm today.
Tuesday morning's weather for the west of the region