LOT Polish Airlines Flight 7 increased engine wear, since the engines were under greater load. NK-8-4 engines were not reliable enough. Warranty service life was only 5000 hours, and about half of LOT engines failed after 2000–3000 hours. Because of this, Polish pilots often called the Il-62 "flying coffins". In spite of the low reliability, the airline decided to increase overhaul life intervals to reduce the frequency of repairs, which were carried out in Soviet factories and quite expensive. LOT sent a letter to the Ilyushin Design Bureau containing the results of a test in which it was found that the engines could operate normally
The Purloined Letter theorists in the 1960s and 1970s. Jacques Lacan argued in "Ecrits" that the content of the Queen's letter is irrelevant to the story and that the proper "place" of the signifier (the letter itself) is determined by the symbolic structure in which it exists and is displaced, first by the Minister and then by Dupin. Jacques Derrida responded to Lacan's reading in ""Le Facteur de la vérité"" ("The Purveyor of Truth"), pointing out what Lacan "missed" and suggesting that it is not that the letter lacks meaning, as Lacan claimed, but that Lacan made the lack the meaning. The truth,