There have been numerous videos that show a missile hitting WTC 2. The UFO or whatever it is is also seen in many of them.
UPDATE: Flight 175, according to pilotsfor911 truth, was a Boeing 767-222. The length was 159 ft. 2″. The object in this video was much shorter as can be seen by comparing it to the building face, approx. 208 ft.
Though a missile may be any thrown or launched object, it colloquially almost always refers to a self-propelled guided weapon system.
Types of precision-guided ammunition 1 Radio-controlled weapons 2 Infrared-guided weapons 3 Laser-guided weapons 4 Radar, infrared, IR imaging and electro-optical guided weapons 5 Millimeter-wave radar 6 Satellite-guided weapons 7 Advanced guidance concepts 8 Cannon Launched Guided Projectiles 9 Guided small arms