Interesting, one story suggests not terrorism. Egypt's claim screams terrorism. But was the plane within their radar when things went down hill?
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There are four different 'boundaries' to be considered:
1) Territorial airspace extends (at most) 12nm (22km) off a nation's coast, so the aircraft went missing in international airspace.
2) International airspace doesn't belong to any particular nation, but to avoid leaving gaps in coverage, all airspace is allocated to a specified control facility, and the airspace for which a given facility has responsibility is called a Flight Information Region (FIR). The boundary on airway UL612 between the Athinai (Athens) and Cairo FIRs is at waypoint KUMBI, 33° 42' 50N 28° 45' 0E, about 178nm from Egypt and about 101nm from Karpathos in the Greek Dodecanese islands.
3) When a vessel or aircraft goes missing, Search and rescue responsibility is determined by the SAR boundaries, set by international convention, under the Auspices of the International Maritime Organization; The Egyptian SAR boundary coincides with the Cairo FIR boundary.
4) Radar coverage - this is dependent only on the technical capabilities of the radar, and areas of coverage often overlap. Military radar has shorter range than ATC radar for a given power output, but can track aircraft without a working transponder. I don't know the capabilities of the Cairo area control radar, but I would be surprised if MS804 was not visible to both Cairo and Athinai when contact was lost.
The aircraft crossed the Athinai/Cairo FIR boundary about 10nm (19km) before it disappeared from ATC radar; but that's a secondary radar, so its loss can imply simply that the transponder on board stopped - ATC radar these days almost always relies on active responses from aircraft transponders, so a plane disappearing from radar does NOT imply that it is no longer there.
Typically, only the military use much primary radar, and they are tight-lipped about exactly how far they can see, and at what altitudes they lose contact for a given location.
Given the last known position from ATC, it seems likely that military radar in both Greece and Egypt could see the aircraft at FL370, and it wouldn't be surprising if the US Navy also have some primary radar data from the Carrier Battle Group in the Eastern Mediterranean. Turkey and Israel are probably a bit too far away to have any data - and they won't be publishing their capability to see that far over the horizon if they do have it.
There is some speculation that the Greek military tracked the flight on primary radar making turns after loss of contact with ATC, but these rumors are now being disputed by the Egyptian authorities, and it is doubtful that anyone will provide much military radar information unless they can do so without revealing classified details of its capability.
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Actually, that's not been possible for a few years now; all airports in the EU segregate arriving from departing passengers, for exactly this reason.
That's fine but transit passengers need to get to their next plane.
If you are in transit from outside the EU, you have to go through security screening to move from one stream to the other.
OK, I did not know that. Is Albania in EU yet?
No.