A customer enters the boarding gate area at an airport using the Smart Pass service on Tuesday afternoon. The Smart Pass service allows passengers to enter the boarding gate by scanning their faces. [SARAH CHEA] INCHEON — The line at the departure gate in Incheon International Airport was bustling with hundreds of people lined up with their passports and boarding passes in hand Tuesday afternoon, waiting for what could be one hour or so just to begin their security screening. One group of travelers slipped into the fast-track line, bypassing all the rows and queues, and began their security screening after only a brief pause for a quick scan of their faces.

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