Republic Airways Holdings said yesterday that it still plans to shed its Frontier unit by June or July, depending on whether a sales agreement is reached, Reuters reported yesterday. Indianapolis-based Republic, which operates regional carriers Republic Airlines and Chautauqua Airlines, has been looking to divest itself of Frontier since late 2011. It had bought Frontier out of bankruptcy in 2009. The Wall Street Journal reported in early April that two investment firms, Indigo Partners LLC in Phoenix, and Anchorage Capital Group LLC in New York, were competing to buy Frontier. Talks with Republic were at an early stage and could fall apart, the newspaper reported.