Since the first flight in 2003, the Air Ambulance, which receives no government funding, has helped fly thousands of people to hospital.
Former patients Jess Wellborn and Ivor Harris have joined the celebrations, thanking the charity and volunteers for its lifesaving work and speaking of their pride in the air ambulance crew.
Jess was rescued when she was hit by a car and Ivor was flown from Grange Park when a mini digger rolled on him.
Ivor urged people to give to the charity as it begins its next 25,000 missions.
'It's been a blast': pub legend Malcolm the Fish Man retires
Corby man given suspended sentence after showing 'gun' to group in pub
Meet 105-year-old Marjorie - who must be Kettering's oldest property landlady
Kettering NHS worker scoops £1m lottery jackpot just before finishing cancer treatment
Furniture warehouse opens in Corby's old historic cinema complex
He said: “I am so grateful to the air ambulance for all that it did for me. This vital service that really wouldn’t be here if we stopped supporting.”
The air ambulance is organising its own outdoor cinema and firework event for Northampton in September encouraging everyone to buy a ticket and support.
The air ambulance are also holding reunion events across the area for former patients as part of the 25,000 Missions Appeal celebrations this summer where you will be able to see the helicopter and meet the crew.
If you are a former patient and would like to attend you can sign up at theairambulanceservice.org.uk/patientstories or call 08454 130999.
If you are interested in helping support the air ambulance, whether by attending our events,giving up some free time, helping fundraise, or donating, please contact [email protected] or call 08454 130999.