Hi. Thanks for your care. I don't think thermite could have been used as cutting charges in the abovementioned sense. If you see an event of electric welding you will notice that thermite is very slow (it is fast in sparkling, but it is slow in actual job of cutting steel). It will take perhaps 10 minutes or so to cut completely those double-walled steel beams using thermite. Which is far from being sufficient to successfully imitate 'plane' impacts. The steel in that sense was cut by so-called 'hollow-shape explosive charges' - traditional anti-tank weapon, not by 'thermite'. I suggest you forget once and forever about the thermite. It had nothing to do with the 9/11 affair and any claim to the contrary (like calim that 'themite was found in dust') is blatant lie.