Definitions for "Crash Cover"
cover rescued from the crash site of the plane in which it was being flown. Such covers generally have some postal marking explaining their delay and possibly damaged condition.
A cover that has been salvaged from the crash of an airplane, train, ship or other vehicle. Such covers often carry a postal marking explaining damage or delay in delivery.
A cover which has been salvaged from a wreck or crash and delivered to the addressee, usually containing an official explanation of the delay.