If ISIS has figured out a way to smuggle covert bombs onto an airplane, we’ll start seeing a lot more of these. Then we’ll know.
AQ has been trying for 20 years to come up with binary explosives/incendiaries that can be smuggled aboard a plane. That’s why we can only bring tiny shampoo bottles aboard in our carry-ons. One idea that was tried was to combine two chemicals disguised as shampoo etc while in the bathroom. One jihadist brings on A, the other B, and they are mixed in the rest room, causing a massive fire or explosion.
They might have perfected a technique like that.
On a flight originating in Egypt? How hard can it be?