On 22 August 2019, the left engine of a Boeing 737-800 failed for unknown reasons soon after reaching planned cruise level of FL360 twenty minutes after departing Samos, Greece and two attempted relights during and after descent to FL240 were unsuccessful. Instead of diverting to the nearest suitable airport as required by applicable procedures, the management pilot in command did not declare single engine operation and completed the planned flight to Prague, declaring a PAN to ATC only on entering Czech airspace. The Investigation noted that engine failure was due to fuel starvation after failure of the engine fuel pump.