"If one concrete wall stopped that plane, how can such planes(though they were Boeing 767s, bigger than 737) cause complete demolition of 1300-feet tall World Trade Center buildings?"

The truth is planes did not cause the demolition of the twin towers. The planes struck the towers high up, which did not weaken the lower parts of the structure and cause them to collapse. During my several careers I have worked as a logger, lumbering in the timber mines. Trees are not felled by cutting them towards the top, and then falling into piles of firewood rounds at the stump. The structures above the plane strikes were neither harmed, and just as happens when trees are topped by climbers, the upper portions above the plane strikes would have toppled to the sides if that were the only damage to the buildings.

The structures falling into their footprints is proof of controlled demolition. The strongest proof of this is building 7, which was not struck by a plane at all, also collapsing into it's footprint. Additionally, the BBC said it had collapsed ~20 minutes prior to that collapse even showing the structure still standing while they were saying it had collapsed, and 'Lucky Larry' stating directly the building was considered unsafe and was deliberately 'pulled', which is a euphemism for deliberate demolition.

Thanks!