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NWA strike leads to question: Can any worker be replaced?
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Striking Northwest Airlines Mechanics Union members shout comments at a bus carrying replacement workers outside the Minneapolis-St. Paul International Airport early on Friday. (Photo by Cory Ryan/Getty Images)

Striking Northwest Airlines Mechanics Union members shout comments at a bus carrying replacement workers outside the Minneapolis-St. Paul International Airport early on Friday.

(Photo by Cory Ryan/Getty Images)
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