This combination of Associated Press file photos shows, left, passengers checking-in at an American Airlines ticketing counter in 2011, in Dallas, and right, a row of self-check-in kiosks in 2012, in Seattle. Many middle-class workers have lost jobs because powerful software and computerized machines are doing tasks that only humans could do before. (AP Photo)

Associated Press
This combination of Associated Press file photos shows, left, passengers checking-in at an American Airlines ticketing counter in 2011, in Dallas, and right, a row of self-check-in kiosks in 2012, in Seattle. Many middle-class workers have lost jobs because powerful software and computerized machines are doing tasks that only humans could do before. (AP Photo)
This combination of Associated Press file photos shows, left, passengers checking-in at an American Airlines ticketing counter in 2011, in Dallas, and right, a row of self-check-in kiosks in 2012, in Seattle. Many middle-class workers have lost jobs because powerful software and computerized machines are doing tasks that only humans could do before. (AP Photo)
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