the metrojet was almost at FL310 (filed for FL360 ) on heading 351' out of SSH at 400kts
at the same time there was another Russian A321 Nordwind flight NSW1969 in the vicinity on reciprocal course 150' level at FL330 heading for SSH just 10 km ahead and to the right side of the metrojet 321 at a speed of 509kt
if the ISIS videos were true with that explosion and black smoke trail would/should the Nordwind crew and/or pax possibly have seen something?
see here
https://twitter.com/FMCnl/status/660378915496730625
that's all been very quiet on that