A commercial 'Adam Air' passenger plane lost contact with flight controllers Monday as it flew between Indonesia's Java and Sulawesi islands, the company's chief executive said. Aviation authorities are unable to contact Adam Air flight KI-574, leading executive Gunawan Suherman told The Associated Press. "We can't say what happened yet, we are still coordinating," Suherman said. The missing plane is a Boeing 737-400, carrying six crew and 96 passengers, including 11 children, Indonesia's El-Shinta radio reported. A news conference has been scheduled for 9 p.m. (1400 GMT), Suherman said. Indonesian Transport Minister Hatta Radjasa confirmed the plane had lost contact, but could provide no more details.