Consider these links:
U.S., McCain, Israel, & ISIS: The Shooting Down Of Russian Passenger Plane 7K9268 Over Egypt.
on 10/31/15 soon after the downing of the Russian Plane was announced, the Guardian ran links with these two articles on facebook:
Syria’s horror shows the tragic price of western inaction (the photo accompaning this article displays Cameron & Obama looking up to the sky, smiling)--
Sisi comes to London: why is David Cameron welcoming Egypt’s autocrat to the UK?
http://www.theguardian.com/world/2015/oct/31/why-is-david-cameron-welcoming-egypt-autocrat-president-sisi-to-london?CMP=share_btn_gp (the timing of Sisi's visit to London after the Russian plane was downed appearred to me to be suspiciously timed)
Also factors playing into the downing of the Russian plane include John McCains' statements in these youtube videos: