schottolo ha scritto:
La fonte mi pare di averla già inserita.
Comunque è un memorando del NIST presente a questo indirizzo:
http://wtc.nist.gov/NCSTAR1/PDF/NCSTAR%201-2.pdf

Appena si è caricato basta cercare 707, o qualche altra parola chiave, (ctrl+f).

(Pag 118, 1,3 AIRCRAFT IMPACT DAMAGE ANALYSIS
decima riga.)

"The buildings have been investigated and found to be safe in an assumed collision with a large jet airliner (Boeing 707 - DC 8) traveling at 600 miles per hour. Analysis indicates that such collision would result only in local damage which would not cause collapse or substantial damage to the building and would not endanger the lives and safety of occupants not in the immediate area of impact."