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
Challenger brand The concept of a challenger brand was first introduced by Adam Morgan in 1999 in the business book, ‘Eating the Big Fish’. In this book, three specific criteria for challenger brands were defined: one, state of market, meaning the brand is not a market leader nor a niche brand; two, state of mind, meaning the brand has ambitions beyond conventional marketing resource; three, rate of success, meaning the brand has experienced significant and rapid growth. Challenger brand A challenger brand is a brand in an industry where it is neither the market leader nor a niche brand. Challenger brands are