That building obscuring the wing of the airliner, is infront of the airliner's flight path as viewed from the point of view of the videographer lower and in the ground level. The second video is from another perspective based on the angle of sunlight. The first video is from a view off to the lower side back of the WTC showing the airliner flying into the building. The second video has the WTC building blocking the fligthpath from the viewpoint of the second videographer. This is why you can't see the airliner hit the building. Finally an airliner aluminum or what not still filled near fully with fuel, weighing hundred of thousands of pounds flying at probably 300 mph or more will have no problem invading the concrete and steel construction of the WTC building during its crash. The airliner disintegrated but still hit with massive amounts of force. I know people look of inconsistencies and problems with 9/11 events but sometimes one in their search still have to accept some realities.