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
Government contract flight most routine military charter flights. The government receives an extremely economical source of emergency capacity as well as reasonable costs for peacetime military transportation. Most American government contract flights are sponsored by the military. While many of them are used to move cargo, some are operated as scheduled airline services. These flights are virtually identical to standard airline flights, complete with flight attendants, meal service, and in-flight movies. A contract flight returning from an overseas area is often referred to as a freedom bird, since it usually carries military members who are returning to the United States after what is