The reason that British Airways' app displays "An unknown error has occurred" 40-80% of the time isn't (just) that they fired all their IT staff and outsourced to low bidders overseas. It's that, sure – but also that BA's first computers ran on electromechanical valves, and everything since has to be backwards-compatible with a system that one of Alan Turing's proteges gnawed out of a whole log with his very own front teeth. Code is a liability, not an asset (BA's new app is years behind schedule).