They've been credited with increasing the chances of surviving a serious injury by up to 20 percent.
But charities like the East Anglian Air Ambulance and Essex and Herts Air Ambulance receive no government funding, and rely entirely on donations to keep going.
Jonathan Wills and Elodie Harper spoke to Diana Jakubowska from the East Anglian Air Ambulance about how they manage to fund their work and keep flying.
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Mostly dry overnight. Some warm sunshine Sunday, however thunderstorms possible.
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A sexual predator who attempted to rape a woman he met through a dating website has been jailed for more than nine years.