Empire State B-25

It may be "obvious" that a heavy plane hitting a skyscraper would deliver a "tremendous" shock, but it doesn't follow that the building must therefore collapse. In 1945 the Empire State Building was hit by a B-25 bomber, but it was still standing last time I saw it. "Ah yes, but it was the impact plus the fires!" Well, when the B-25 hit the Empire State Building "its fuel tanks were reported to have exploded, engulfing the 79th floor in flames",

http://www.serendipity.li/wot/other_fires/other_fires.htm