Every airline executive in the world must have winced this week at a video going viral of a passenger forcibly removed from a double-booked seat.
Who knows how often this has happened? Until the advent of cellphone cameras an incident such as this would have been no more than a tale told by the passengers who witnessed it.
But now, any action of an over-zealous employee is capable of hurting a company as badly as United Airlines, whose shares plummeted with its public image this week.
Social media is a mixed blessing but its ability to expose bad behaviour instantly and globally, is unquestionably a force for good.
Every airline will have been checking its own procedures in the wake of United's embarrassment this week and ensuring front line staff know the limits.