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Questions related to airports themselves rather than "airlines" and "air-travel", which have their own tags. "Airport-transfer" is also covered by a separate tag.
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What did I do to set off a siren at the automated e-passport gates in Heathrow arrivals? [closed]
Earlier today as I put my passport in an automated e-passport gate on the way back into the UK at Heathrow Terminal 3, a siren went off (!). What could that mean?
Did I make a mistake using the mach …