Text: When air disasters occur, there is an investigation to determine the cause, much as, at the end of a relationship, we try to understand why it failed, but without the advantage of voice recording, so we're left to squabble endlessly over who said what.
Entailment: After a disaster like a plane crash, an investigation occurs into why it happened.
Contradiction: Like failed relationships, the aftermath of an air disaster leaves everyone wondering what happened, but there's no way to find out.