Crash would seem most likely - about 70%.
Followed by a still significantly considerable chance of terrorist activities. You would have to set in motion stringent cautionary preparations/watch activities.
Not mentioned here was the possibility that this plane could fly across the Atlantic undetected to reach the US. It would not have a full load of fuel, but could still inflict a lot of damage...
I pray that evil of this kind is defeated. The Islamists bent towards destruction and terror only shows their devotion to following satan and building their horrible demonic Mohammedan cult...