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
Honor Flight The Springfield group and HonorAir soon merged to form the Honor Flight Network. As of 2014, the Honor Flight Network is still headquartered in Springfield, Ohio. Both Jeff Miller and Earl Morse were awarded the Presidential Citizens Medal in 2008 for their extensive work with the program. In 2015 the first all-female honor flight was held, with 140 female veterans. Flights arrive in any of Washington's three area airports: Ronald Reagan Washington National Airport, Baltimore/Washington International Thurgood Marshall Airport, and Washington Dulles International Airport. Southwest Airlines is the official commercial airline of the Honor Flight Network, although the network utilizes