Carl King once used alligator tweezers to dislodge a piece of cotton from deep within the ear canal of an Israeli soldier traveling through Nashville. King is a physician's assistant at the CareHere clinic near Terminal C at Nashville International Airport. CareHere has 140 clinics in 22 states, most of them built for employers who offer on-site care as a perk to employees. But the airport clinic is special, said Ernie Clevenger, the company's president, because it is the first airport clinic that treats airport personnel and passengers.