25 Planes Impacted the WTC // 1000's of plane parts were recovered, including this jet engine.... (www.youtube.com) posted 1 year ago by Oh_Well_ian 1 year ago by Oh_Well_ian +27 / -2 57 comments share 57 comments share save hide report block hide replies
High explosives are not heavy and titanium is very light, lighter and stronger than alloy aluminum.
Being drones, they were passenger free and flying very light. Most likely did not have a full load of fuel, either, making them more agile and faster.
Not needed, 7075 t-6 will do the job just fine. It not quite as hard as steel but damn close to it.