Air travel may not resume to pre-pandemic levels for years, and demand for jets will continue to lag, Boeing's CEO said in a shareholder call Monday. Stock prices dropped after a $4.2 billion Brazilian partnership deal fell apart. "We are in an unpredictable and fast-changing environment, and it is difficult to estimate when the situation will stabilize," David Calhoun, Boeing CEO, said in a virtual annual shareholder meeting. "When it ...