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
National Airline History Museum was being renamed the National Airline History Museum. This name change allowed it to be better positioned to receive Federal grants and other national funding. The museum announced in March, 2011 that it had teamed up with Kansas City's Roasterie Coffee Shop, with the Roasterie brand being known as "The Official Coffee of the National Airline History Museum" and carrying an image of the museum's DC-3 on its coffee products. The museum maintains five aircraft at the site; two are in flying condition and one is undergoing restoration. An additional corporate mock-up is also on display. There were only 103