LOT Polish Airlines Flight 5055 accident's cause was similar to that of LOT Polish Airlines Flight 007's crash seven years earlier. After the disaster of Flight 007, the Polish investigatory commission established that its engine shaft disintegration was the result of metal fatigue; improper alloy preparation resulting in a defective mechanism which was less resistant to fatigue; and a faulty design of the engine shaft. Detection of these faults was possible only after complete disassembly of the engine and detailed analysis of all its elements, and as such was beyond the capabilities of aircraft maintenance personnel. These concerns were addressed by the Polish Government's Special
Janet (airline) similar openings. Janet flights operate with a three-digit flight number and a "WWW"-prefix. In the official publication of ICAO airline codes, this specific three-letter designator is listed as being blocked. Common Janet destinations, mostly military, include: The first flights from Las Vegas to Area 51 were performed in 1972 by a Douglas DC-6 operated by EG&G. A second Douglas DC-6 was added in 1976 and this type remained in use until 1981. As of mid-2015, the Janet fleet consists of six Boeing 737-600s painted white with a prominent red cheatline. There are also five smaller executive turboprops (two Beechcraft 1900s