American Medical Response, or AMR, which provides ambulance services in San Diego and across the country, will be acquired under a $2.4 billion cash deal announced Tuesday.

Envision Healthcare Corp. reached a deal to sell subsidiary AMR to KKR & Co, which plans to combine AMR with Air Medical Group Holdings, a Dallas-based air and ambulance emergency services company.

AMR, headquartered in Greenwood, Co., is the largest provider of U.S. ambulance services, with a footprint in San Diego that covers 15 jurisdictions, such as Encinitas, Del Mar, National City and Chula Vista.

“The agreement aligns AMR with KKR’s Air Medical Group Holdings which is one of the largest independent providers of emergency air medical services in the world. Our San Diego operation is pleased about this strong partnership. The pending acquisition is subject to regulatory approval, which could take up to three months,” said Madeleine D. Baudoin, government and community affairs manager, AMR San Diego, in a statement to the San Diego Business Journal.

In response to a question about how the deal would affect AMR San Diego operations and staffing, Baudoin said:

“There will be no changes to our current operation. We employ 1,200 people in the county and we are currently hiring paramedics and EMTs.”