Documents show how Clear, which lets its members skip security lines at 35 US airports, is building a digital ID system for storing health care info and more (Dave Gershgorn/OneZero)

Dave Gershgorn / OneZero:Documents show how Clear, which lets its members skip security lines at 35 US airports, is building a digital ID system for storing health care info and more'You are your driver's license, your credit card, your health care card, your building access card'In March, the air travel industry ground to a halt.
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