[ChadGore]

Re: Weather could be another possibility.

I'm no aviation expert, but here is the data for Rostov-on-Don, Russia

Weather > Russia > Rostov-on-Don

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Today

20° 2:00 MSD Tue	Mostly Cloudy	High 27°
		Low 18°

Humidity:	94%
Wind:	W/11 km/h
Visibility:	9.99 km
Dewpoint:	19°
Barometer:	Unknown
Sunrise:	6:29
Sunset	20:16

<-10

-10

-5

0

5

10

15

20

25

30

35+

Wed		Thu		Fri		Sat
Rain		Showers		Showers		Partly Cloudy
High 23 Low 15		High 22 Low 12		High 26 Low 13		High 28 Low 13

[Wolfstar]

I'm no aviation expert either, but don't most airliners fly above all but the worst weather (like hurricanes, which extend into high into the upper atmosphere)? The real point being that even the Russian authorities are not ruling out the possibility of terrorism.