I think I have a possible target after refitting the a/c...the Petronias Towers, very large will do a lot of damage when hit esp. if a/c is full of explosives or small nuke or other WMD’s. The a/c would not need a full fuel load to reach them, but the mix of jet fuel to air would make a large explosion/burn upon impact. The towers do a lot of business with the “Western World” , making it one big fat target.
The towers are in Kuala Lumpur. Why wouldn’t they have plowed into them after they took over the plane and made their U-turn back across Malaysia?