Boeing Chairman and Chief Executive Officer Phil Condit told financial analysts during a conference call today that he was optimistic a contract for leasing 100 Boeing 767 tanker aircraft would be signed "by the end of the year." "I think every sign we're seeing is positive," Condit said during the call on his company's third-quarter earnings. "That doesn't mean we've worked through all the issues, but we are working through them, and I am very optimistic [a contract will be...