Vision Airlines officials say so far, their new service in Louisville appears to be sustainable.Vision has flown charter flights out of Louisville International Airport for years, but they have only recently begun a twice-daily service to Atlanta. Director of sales Clay Meek says advance ticket sales have met expectations."We'd like to see the planes run at 75%, which is about 25 people-per flight," he says. "And we've been coming close to those numbers, depending on the days. But as we go forward, it looks to be a very successful launch so far."Meek says if the service becomes more successful, Vision offer more services or larger planes in Louisville.