The upgrades include air handling repairs, additional filter stages, new air supply lines and a new dedicated paint mixing room.
"As the company continues to grow, we remain committed to providing the highest quality aircraft painting services in the market," said president Chris Harano. "Over the last year, we have made considerable improvements at numerous locations to do just that."
The California-based firm also announced it has opened a second aircraft-painting hangar at the airport in Spokane. The $6 million hangar has one large painting bay that can handle aircraft up to the size of a Boeing 757-300.
Leading Edge helped American Airlines work on its new livery which debuted in January 2012. The firm painted more than 80 aircraft in 2013 for American and American Eagle with the new paint scheme. The company has also painted aircraft for United Airlines, Delta Airlines and Southwest Airlines.