At the height of The Persian Gulf War I was tasked into Riyadh International to pick up a certain General and entourage and take him to the UK. The Americans in charge of ATC said that I did not have authority to land. We orbited with missiles pointed at us for 1/2 hr before I persuaded them to let us land. I taxied to the Royal Pavilion and closed down. An American Colonel leapt on board and said, 'what are you doing here your passengers are at Riyadh Military'. I very calmly asked the Nav for the tasking file and then burst out laughing in relief - a tasking c*ck up. The Col couldn't understand my reaction, apparently I was supposed to be devastated. 'OK how long to re-fuel, file a flight plan and get over to the Military airfield' - '2 hrs'. 'How long for him to drive over here' - '1/2 hr'. 'Get him a car please'.