So what's stopping them from flying to Canada and taking a connecting flight? Or putting the device in the cargo hold, landing in the US, and detonating it at

So what's stopping them from flying to Canada and taking a connecting flight? Or putting the device in the cargo hold, landing in the US, and detonating it at any sports event or concert? This whole thing smacks of Security Theater more than anything else. https://en.wikipedia.org/wiki/Security_theater https://en.wikipedia.org/wiki/Security_theater