An Arkansas airport director who was fatally wounded in a shootout with federal agents this week was being investigated for illegal arms sales, according to unsealed court documents.Bryan Malinowski, who was 53 and the executive director of Little Rock’s Bill and Hillary Clinton National Airport, was shot when the agents arrived at his home early Tuesday to serve a federal search warrant, the Arkansas State Police said. He died on Thursday, according to statements from his family and the airport.State police said the shooting, also in Little Rock, took place at around 6 a.m. Tuesday. The…