Wiltshire Air Ambulance says it has begun carrying blood plasma for the first time from today.
Both helicopters and Rapid Response cars are already able to carry red blood cells - leading to 72 patients receiving blood transfusions on the way to hospital since 2015, they say.
Plasma contains essential clotting factors to help stop bleeding. It is freeze dried and in powder form in a glass vial.
Paramedics mix it with water to form a yellow liquid before it is given intravenously to critically ill patients in an emergency.
Ben Abbott, critical care paramedic and operations officer at Wiltshire Air Ambulance, said: “We believe this will improve their chances of reaching hospital alive in order for them to receive further emergency treatment."
Richard Miller, clinical services and ground base manager at Wiltshire Air Ambulance, said: "Having blood products on board our aircraft and Rapid Response Vehicles is only possible thanks to the kind donations our charity receives from the community, businesses and grant-making trusts to run our vital service.”