The machine-operated cafe was first opened in San Francisco in 2017, and quickly gained worldwide attention as the having the first robot baristas making coffee.
The company's founder Henry Hu tweeted that the downtown locations helped Cafe X develop the machines now operating at SFO and San Jose Mineta airports.
He also hinted that more airport locations may be coming.
Cafe X is offering refunds to anyone with pre-paid app credits.
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