>>507897399
>4 planes
It was actually 5 airplanes that day. The 5th was running late to the tarmac and didn't take off on time due to mysterious "electrical glitches" described by the pilots and staff afterwards as "being hacked".
People think the intended target could have been building 7. Which, if true, would explain it's collapse, and bring new meaning to why Larry Silverstein said what he did about having to "pull it".