Especially if a flotilla ship sinks. And the Turks can point the blame to Israel.
Then Turkey would, undoubtedly, invoke Article 5 of the NATO Charter:
The Parties agree that an armed attack against one or more of them in Europe or North America shall be considered an attack against them all and consequently they agree that, if such an armed attack occurs, each of them, in exercise of the right of individual or collective self-defence recognised by Article 51 of the Charter of the United Nations, will assist the Party or Parties so attacked by taking forthwith, individually and in concert with the other Parties, such action as it deems necessary, including the use of armed force, to restore and maintain the security of the North Atlantic area.
That really worries me. Turkey is probably the only country in the area which is militarily more powerful than Israel.
If they do, and if I understand correctly, Turkey will have perpetrated an act of war. Does the NATO Charter apply when a member state is the aggressor?
The Parties agree that an armed attack against one or more of them in Europe or North America
I may be mistaken but I’m pretty sure that Israel is nowhere near the North Atlantic ocean. NATO will tell Turkey they’re on their own.
But not in the Middle East! Don't think even the EU claims the waters out off Gaza, yet!