The suspected murder-suicide crash last month of a Germanwings flight killing 150 people has focused attention on how airlines can better monitor pilots for signs of mental illness, improve relations with employee unions and improve training, among other aspects. The flight of Germanwings, a low-cost subsidiary of German airline Lufthansa, crashed into the French Alps on way from Barcelona, Spain, to Dusseldorf in Germany. Early investigations point to a deliberate suicide by the flight’s co-pilot, Andreas Lubitz, who had a history of severe depression and had previously been treated for suicidal tendencies. The crash was “essentially an act of terrorism” and it is impossible to prevent all such acts “until we get enough experience with all acts of terrorism,” said Stuart Diamond, Wharton emeritus practice professor of legal studies and business ethics. Diamond acknowledged that Lufthansa has done well in disclosing that the co-pilot had psychological problems and that the company would take remedial steps.…