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A crash cover is any type of cover, (including air accident cover, interrupted flight cover, wreck cover) meaning any piece of mail that has been recovered from a fixed-wing aircraft, airship or aeroplane crash, train wreck, shipwreck or other postal transportation accident during its journey from sender to recipient.

In many cases it was possible to recover some or even all of the mail being carried and the postal authorities typically apply a postal marking (cachet), label, or mimeograph that gets affixed to the cover explaining the delay and damage to the recipient, and possibly enclose the letter in an "ambulance cover" or "body bag" if it was badly damaged and forwarded to its intended destination.