The UK head of government should certainly fly officially in a British plane, preferably an official government transport......but not President Blair, or Robber Brown. They should go airline full-fare economy, so their ticket is changeable and they can come home early, for example when the Arabs burst out laughing at The Great Pension Destroyer when he asks for increased production so oil prices can be lowered ('why? YOU'RE the one screwing from your own people with excess taxes on it!')