From Jason Burke, the SME on terrorism for The Guardian, he concludes that:
If it was indeed an Isis bomb that brought down the plane – and both Egypt and Russia have downplayed any suggestion that the crash is linked to terrorism – then this still does not signal that the group has launched a fully fledged global campaign of violence. Yet.
Link:http://www.theguardian.com/world/201...-war-on-terror

The Soufan Group briefing ends with:
Beyond the immediate theater of the Syrian civil war, the international community will have to recalculate the degree to which the threat from terrorism has increased as a result of the Islamic State joining al-Qaeda as a group capable of attacks outside its main area of operation. It is depressing that after 14 years of counterterrorism measures that have focused in particular on protecting civilian aviation, the threat to passenger transportation seems as real as ever.
Link:http://soufangroup.com/tsg-intelbrie...skies/?catid=3