Your site serves 20'000 users a month. There are more than a billion potential internet users in the world. Your site will not scale.

Everything scales if you put the effort into it. Ok, maybe some things don't, but saying "The Israeli security model will not scale" just because it hasn't scaled, without providing further arguments, is a bit like saying "Rails doesn't scale" without providing further arguments. Sure, Rails does things differently from how PHP does the same things, and that means the performance trade-offs are different, but that doesn't mean it can't be engineered to scale.

And if it makes the passengers/developers happier, it may be worth looking into, not dismissing without argument.

I'm saying that requiring a face to face interaction with every person about to board an airplane in an American airport would be unreasonably expensive and introduce massive delays.

I won't deny that it works well in a country with a very high risk of terrorist incidents and a low amount of air traffic.

The US, however, flies 633 million people per year, and is at a much lower risk for terrorist attack.

You've got to pick the right solution for the right problem. Israeli security isn't it.

IMO, there have been exactly two positive security advances post-9/11: you can't barge into the cockpit anymore, and everyone in the air knows to resist attempts to hijack the plane.

Adding more air marshals, creating the draconian TSA, forbidding liquids on flights -- it's not worth the time or money.