[Robe]

Someone placing a bomb aboard is it has to have some sort of timer/triggering device.
Timer...To what time do you set it?, what if there is a gate hold? If you timed it to go off over water, what if there is a course change do to weather?
Trigger.... Barometric, it will “set” at a particular altitude,as the air pressure decreases,and will trigger once
a preset altitude reached.
(In the case of AirEgypt it was at a Cruise altitude and holding)
I thought “Sudden Jahadi Syndrome” at first , but after seeing the ACARS data, I'm not sure anymore.
There is a backup battery inn the avionics compartment for use if all generators fail.
If it was a Lithium-Ion Battery, they have been known to catch fire due to overcharge

[biff]

Anyone think they might set them off with cell phones like they do IED’s? They could track the flight online and when wanted, just make the call. BOOM!

[StAnDeliver]

On FlightAware, flight line transmission ended at exactly 4 hours, 0 minutes.