On 24 December 1994, four hijackers from the Armed Islamic Group hijacked a Air France flight in Algeria. Over the course of the two days it remained on the tarmac, three passengers were murdered by the hijackers as they demanded the release of two Islamic Salvation Party leaders, who had been arrested by the Algerian government, and be allowed to land in France.
On the 26th, the Algerian government allowed the plane to leave Algeria for France. Since the plane's auxiliary power unit was near depleted, the plane landed at Marseilles. It was here that the French GIGN stormed the plane and killed the hijackers.
After the hijacking, a former leader of the Armed Islamic Group confirmed that the plane was intended to crash into the Eiffel Tower.
Here comes the POD.
Before the hijacking officially began, the four hijackers entered the plane and pretended to be police, conducting passport checks, which delayed the plane, tipping off the Algerian military which then tipped off the hijackers that the military knew something was up.
What if instead of doing the passport checks, the hijackers just told the passengers they were there to provide extra security for the plane and so the plane leaves the airport on schedule and when the plane is in French airspace over Paris, the hijackers then take over the plane and crash it into the Eiffel Tower?
https://en.wikipedia.org/wiki/Air_France_Flight_8969