The Wiltshire Air Ambulance is able to fly again after finally receiving a new Air Operator Certificate.
They say it will return to service immediately.
The charity is now just one of four air ambulances who hold their own Air Operator Certificate.
Wiltshire Air Ambulance chief executive David Philpott says: “This has been a hard slog and has taken a lot longer than we anticipated – and a lot longer than it really should have.
“I would like to thank everyone who has worked tirelessly for the charity to get the AOC; they have all gone the extra mile.
“Our trustees have provided rock solid support throughout the process.
"Equally the backing from our Ambassadors and local MPs has been very welcome.
“Our pilots, paramedics and charity staff deserve immense credit for their work during this challenging period, along with our dedicated volunteers who are out supporting the charity at events come rain or shine.
“Importantly we are now able to return to what we are here to do, providing helicopter emergency medical services for the people of Wiltshire and surrounding areas.”
The helicopter was grounded in January after its operator went bust.
Heli Charter, which had run their helicopter since 2014, went into voluntary liquidation on December 31 last year.
Later in January the charity then announced its costs had increased by 15 percent.