Airplane maker Hawker Beechcraft Corp. told employees Tuesday that 2,300 of them will lose their jobs before the end of the year and warned more layoffs may be coming. In a letter to workers, Chairman and Chief Executive Jim Schuster said most laid off workers will be notified by Friday. Nearly 500 Hawker Beechcraft workers also lost their jobs late last year. In addition to declining orders and deliveries, the Wichita-based company is facing a host of new challenges, Schuster said. "The government's stimulus package has failed to sufficiently loosen credit markets, which are absolutely vital to the success of...