That's true, it's impossible to prove a negative. However one must prove a positive or it is no more than conjecture/theory and NOT FACT. The US government claims 4 specific airplanes (AA77, UA93, UA175 and AA11) were hijacked on 9/11 and all 4 crashed. They even claim to have recovered some parts and RFDs from the 4 planes. So where's the "plenty of proof" that the recovered parts actually belonged to the claimed 4 planes? They have the parts (so they claim) and some RFDs and it is an industry standard that they all have serial numbers that are documented and logged as physically belonging to the planes, but they haven't produced the match of ANY of the serial numbers to the logs. This is HARD EVIDENCE, evidence that's a key part of any forensic investigation into any airplane crash. It's the one of the easiest and most definitive ways to match parts to airplane. It's a match that the US government should readily and confidently publish as its "plenty of proof" to avoid any controversy, but the match is non-existent. This is as basic as it gets. Without that, the "plenty of proof" claim is no more than vaporware. Similarly, there is no legitimate "plenty of proof" claim for the OCT's claim that fires/planes or both completely leveled 3 high rises on 9/11. A scam investigation does not qualify as "plenty of proof". http://www.politicalforum.com/9-11/458597-nist-9-11-scam-exposed-all-its-glory.html Sorry, there's not "plenty of proof", there's no proof at all to the government's OCT claim. There can't be anyway since there never was any legitimate official investigation into 9/11. What we do have plenty of proof of is that the official 9/11 investigations were all frauds. That proof is overwhelming.