...as a "duh" SOP: never less than 2 on the flight deck, period! One pilot needs a potty break, put a purser or flight attendant on the flight deck!!!
Suggestions are welcomed as to how this procedure should be implemented on freighters, preferably without financially crippling the industry. Or are freighter operations excused from this rule? Reason for asking is that it's actually more common for the person commandeering the vessel to commit suicide, and when metal starts falling from the skies does it really matter if it holds 50 tons of carbon based organisms or 50 tons of laptops?