(CNN) - Extensive audio recordings from September 11, 2001, capture a raw, vivid, moment-by-moment account of the terrorist attacks, directly from those who were in the middle of the crisis.

In excerpts posted online - some of which were declassified only within the past year - listeners can hear everything from the wrenching words of a flight attendant on a hijacked airliner and the haunting voices of two of the terrorists in the cockpits, to the cross talk of air controllers and military officials as they come to realize the extent of the attacks.

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