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
American Eagle (airline brand) subsidiary of Trans States Holdings, began American Eagle operations on March 27, 2015, as part of a deal to operate 20 new Embraer E-175 aircraft on behalf of American. These aircraft are based at American’s Los Angeles hub. Air Wisconsin had announced it would exclusively fly as United Express which commenced in March 2018, ending their involvement in operating flights under the American Eagle brand. In May 2018, American Airlines announced the termination of its partnerships with ExpressJet and Trans States Airlines as of 2019, meaning the end of those operators conducting American Eagle flights. As of December 2018, the