Korean Air was ordered to revise its mileage conversion program with Asiana Airlines by supplementing a mileage redemption program for in-flight seats, the nation’s antitrust watchdog said Monday. The Fair Trade Commission (FTC) urged Korean Air to submit revised measures on the management of bonus seats and seat upgrades using mileage. Korean Air has less than a month to report its updated measures. This is the second time that the authority has put the brakes on Korean Air’s proposed mileage integration plan. In June, the FTC rejected Korean Air's initial mileage conversion proposal on concerns that it may limit the interest from Asiana’s customers. Three months later, Korean Air submitted its rectified measure that would allow Asiana customers to convert their flight-accrued mileage at a 1-to-1 ratio. Korean Air also offered to apply a 1-to-0.82 conversion ratio for Asiana customers’ partner mileage earned from their credit card rewards. “We view that the mileage conversion plan should be fixed in line with the expectations of the public, so the FTC will review the proposed