Jump-seated once from GLA-MAN with an idiot TCX management pilot, who took plog of 4.6 tons in an empty A330. Legal, but crass. Said idiot got caught out badly using plog fuel on a long one to CUN. He was forced to divert to a veery nearby airfield on super-low fuel. Still he didn't learn his lesson. And he is still a management pillot with a UK operator. Sad business, boyo.