Very well-written analysis with factual support for three main points about this kind of attack: it's entirely feasible, it's cheap, and it's virtually undetectable.

And the devastating effectiveness has just been live-demonstrated to an audience very interested in that kind of stuff.

So, yeah, air travel is going to become, eh, a bit different, soon. Get those cellphones and laptops with removable batteries while they're still available (and ensure the packs are models you can easily buy at your destination), as anything battery-powered is going to be off-limits in both the cabin and the cargo hold as soon as the now-extremely-motivated international terrorist community gets around to downing the first, oh, three airliners or so?