I wondered why there aren't more security checks as you enter an airport ie. before check-in. But hubby said it just isn't feasible to have so much security, due to cost & the logistics of the whole thing. Yes they have put bollards up immediately outside entrances, which stops the cars, but is absolutely no use for passengers walking in. Maybe they'll rethink that one. However, none of that would have helped on the Metro, unless bags were scanned there too. I've had my bag scanned at a railway station in London in the past.