Yes, it was most definitely an inside job. I'll go through a couple of discrepancies chronologically. A passenger airplane would fall apart if it'd fly at the height and speed that was presented. Even if the flight was technically possible, there's no way amateurs could perform such a flight. A lot of top pilots claim they wouldn't be able to fly a plane into a building like that. Fire has never caused a building to collapse before or after 9/11, and it would definitely not have that effect on the twin towers. They were built to withstand a plane impact. The buildings contained an inner structure that'd remain standing on its own even if the floors had collapsed. It clearly wasn't a normal collapse. Rather it was a controlled demolition with explosions inside the building going off to make it look like a collapse. The evidence of that is found in the numerous videos of the collapse: flashes of explosions are seen below the point where the collapse is taking place, there are molten beams, and debris is ejected horizontally. In fact, the debris ends up covering Manhattan. The weight of the rubble is only a fraction of the building that had been above it. That doesn't happen with a normal collapse. And the timing of the collapses are more consistent with controlled demolition. It only takes slightly longer.

There are lots of resources on all of this. Loose Change is a classic still worthy of recommendation. Richard Gage's presentations are great and focus purely on the science of the collapses. Christopher Bollyn should be especially of interest to this community, as he focuses on the connection with Israel.

A talk about 9/11 by David Chandler, purely focused on the physics. The 9/11 Masterpiece - Christopher Bollyn connects every dot.