Aus 9/11 Wiki
Jeff Analauf allegedly felt the blast from within the Sheraton Hotel.
"Jeff didn't feel the impact of the plane crash as directly as his wife. He was attending an environmental meeting on the second floor of the hotel when the plane struck the Pentagon. About five seconds before the crash, Jeff said he heard the sound of "tin being dropped," likely as construction workers building an addition to the hotel saw the plane and dropped their building materials. "Then, about 5 seconds later, the whole hotel shook," Jeff recalled. "I could feel it moving. We said 'Oh, my gosh, what's going on?' "
He did not see anything.
Source List: Bart