Air traffic used to be everything flew to places local to it but now there's a system of hubs, Chicago o 'hare for instance or Newark where planes fly through.
Testing will take place for at least 60 days at the Holiday Inn Chicago o 'hare Rosemont and the Holiday Inn Express Houston Downtown Convention Center, starting next month.
这项测试将在芝加哥o ' Hare Rosemont的假日酒店和休斯顿城市会议中心的快捷假日酒店进行，该测试将从下个月开始并持续60天。