although jet fuel couldnt alone melt the metal the combination of both aluminium and plaster (both present a t the time of the crash creates what is known as thermite which when combined with heat creates a reaction that can create thousands of degrees of heat ... thus melting the metal....
also in theory the metal wouldnt even have ot be completely melted because of the fact that metal when heated exponentialy loses strength; so all youd need is to heat the metal up somewhat.... not to mention that the thermite could have melted right through it.
ps .... most conspiracy theorys can be solved through common sense and good ol science.
ie the mythbusters moon landing hoax special
not saying we shouldnt question some things but use your head