http://www.theguardian.com/world/2015/feb/03/pilot-murder-jordan-anti-isis-campaign
Pilot’s murder may weaken Jordanian support for role in anti-Isis campaign
It is hard to see Jordan withdrawing from the US-led coalition, but King Abdullah may now become more cautious
Being a group that tries to terrorize their opponents whenever possible, the sub-humans may think that this will intimidate pilots from pressing home air attacks. In fear of being shot down.