Since the location of this smartcard wireless device can be tracked in {TAIL ~ the airport} by normal wireless antenna location means, by GPS, or by direction fixing between multiple antennas, or any other tracking means, the approximate location of the person is known at all times while in any area of the airport or {HEAD ~ building} 
Since the location of this smartcard wireless device can be tracked in { TAIL ~ the airport } by normal wireless antenna location means , by GPS , or by direction fixing between multiple antennas , or any other tracking means , the approximate location of the person is known at all times while in any area of the airport or { HEAD ~ building }
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