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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Suffolk boxer Anthony Ogogo says he wants to make up for lost time in his pursuit of a world title.
Many places will stay cloudy this afternoon, although there will be a few bright spells around. Scattered showers will develop in places.
People across East Anglia have been turning out in big numbers to remember those who lost their lives in the Battle of the Somme.