Air ambulance companies are not on most investors’ radar, yet at least one acquisition of this ancillary healthcare service pops up about once a year. This year’s deal came early, as KKR & Co. LP (NYSE: KKR) paid an undisclosed amount for Air Medical, an air ambulance company based in Lewisville, Texas. It was owned by affiliates of private equity firms Bain Capital and Brockway Moran & Partners. Last year’s air ambulance deal was announced in August, when privately held REACH Air Medical Services of Santa Rosa, California acquired Emergency Airlift Service in North Bend, Oregon. No prices were disclosed, of course. In fact, the last price we recorded for an air ambulance company was $11.9 million, paid by Emergency Medical Services Corporation (NYSE: EMS) for Air Ambulance Specialists Inc. back in June 2006.