One way for airlines to reduce the friction that has been cropping up lately between employees and passengers may be to reduce the contact between the two groups of humans—and help customers avoid waiting in lines like the one above.

Delta is testing facial recognition technology at the Minneapolis-St. Paul airport this summer that allows customers to check their own bags using a self-service bag-drop machine equipped with software that matches customers’ faces with their passport photos through identification verification, which Delta called a “first for US carriers.”

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