West Essex Bowmen

The Essex Air Ambulance Charity was established and began fundraising in 1997, launching as a dual-paramedic and single-pilot service from New Hall School in Boreham, Essex in July 1998. In 1999, the service began operating seven days a week, during daylight hours, as opposed to the previous five-day service.

In 2003, the Essex Air Ambulance was upgraded to a Eurocopter EC135 T2

In April 2007, the Essex Air Ambulance charity became known as the Essex & Herts Air Ambulance Trust, responsible for both the Essex and the new Hertfordshire air ambulance services. The Hertfordshire air ambulance was introduced on 5 November 2008. With the launch of the Hertfordshire aircraft, Essex's operational colour stayed as yellow and Hertfordshire gained red – both of which featured on the helicopters G-EHAA and G-HAAT.

Doctors were introduced to the Essex Air Ambulance Air crew in July 2008. This doctor/critical care paramedic model is used on both aircraft at all times. Pre-hospital care doctors could then work alongside specially trained critical care paramedics from the EEAST to optimise patient outcome. Doctors are employed by Mid Essex Hospital NHS Trust, on behalf of EHAAT – except for a team of consultants, who are seconded from some of their hospital work. Paramedics are provided by EEAST. All paramedics are trained to critical care qualification, while doctors have a sub-speciality inPre-hospital emergency medicine. The team of doctors also included a small number of consultants.

In 2011, The Essex Air Ambulance's operational base moved from Boreham to Earls Colne Airfield and the charity head office and Essex fundraising team moved to Earls Colne Business Park in March 2015.

In March 2017, to coincide with the charity's 20 year anniversary, a new brand was launched which unified Essex and Hertfordshire's previously separate identities to signify the united future of the charity.

From October 2019, the critical care team became available 24 hours a day, 365 days a year. This was the first time in the charity’s 21-year history that was able to provide a fully 24/7 aeromedical service to the people of Essex, Hertfordshire and the surrounding areas