First it was heat flashes detected by a satellite. Now, we’re hearing the sound of an explosion can be heard on the cockpit voice recorder of the Russian jet that crashed last weekend in the Sinai desert. Not only that, there are reports the jet sat unattended on the runway at Sharm el Sheikh for an hour. Security experts saying that’s ample time for someone to sneak a bomb into the luggage hold. Add to this a report from that a British jet, en route to Sharm in August, narrowly dodged a missile; that the device came within a thousand feet of the jet. Security screening is being tightened, and flights are being cancelled as investigators continue to look for evidence of a bomb in last week’s crash.