And even that requirement seems to have been dropped. From Wikipedia: "Aviation authorities swiftly implemented new recommendations from the European Union Avi

And even that requirement seems to have been dropped. From Wikipedia: "Aviation authorities swiftly implemented new recommendations from the European Union Aviation Safety Agency that required two authorised personnel in the cockpit at all times, but by 2017, Germanwings and other German airlines had dropped the rule." https://en.wikipedia.org/wiki/Germanwings_Flight_9525 https://en.wikipedia.org/wiki/Germanwings_Flight_9525