It defines an « accident » as any occurrence that caused serious injury, death or significant damage to the aircraft. A « crash » is defined as any accident that has the potential to kill everyone on the airplane, and there have been no « crashes » by that definition among major U.S. airlines in the study period.

http://www.flyingmag.com/technique/accidents/website-reveals-nine-most-common-airline-accidents

http://247wallst.com/2013/04/24/the-nine-most-common-airplane-accidents/

http://247wallst.com/2013/04/24/the-nine-most-common-airplane-accidents/2/