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
Virtual airline (hobby) Virtual airline (hobby) A virtual airline (VA) is a dedicated hobby organization that uses flight simulation to model the operations of an airline. Virtual airlines generally have a presence on the Internet, similar to a real airline. Many hundreds of virtual airlines of significance are currently active, with tens of thousands of participants involved at any one time. Virtual airlines were started to give a sense of purpose to activities conducted within a flight simulator program, the first being SubLogic's "", released in 1990. As time has passed, the most common flight simulator used is Microsoft's Flight Simulator. This basic