I remember the V Force had pre and post flight meals - presumably organised originally by one of Bing Cross's minions. What the rules didn't seem to specify was 'when'. 'Off route' you could dine post flight at any time. I remember having a post flight in downtown San Francisco, Honolulu and more mundane places (then) such as Dubai,Rule one was don't put any booze on it. I've dined, courtesy of a grateful nation, in many exotic spots gratis !