You’re running through the airport, waiting in endless security lines, dealing with your baggage, rushing yet again to the gate – if only you’d arrived two hours early! Right? Not necessarily. And airports know that.  For example, along with lots of other secrets, they’re not telling you that some hubs have facial recognition scanners that can easily track you. Or that the cheapest days to fly are Tuesdays and Thursdays. Or that arriving at the airport 2 hours before your flight isn't really necessary. But why do airports recommend to do that? 

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