Corrected entry: In the scene where the Baron is attacking the British bombers over the Western Front, one of the HP 0/400 bombers has the name "Royal Mail" painted on the side of the cockpit. The Royal Mail wasn't in existence during the First World War; it was the General Post Office up until 1981.
Necrothesp
8th Feb 2012
Correction: The Royal Mail was the GPO's actual mail arm, as opposed to its retail, administrative and telecommunications arms, since long before the First World War. It certainly appeared on the sides of their vans back then, so there's no reason a pilot shouldn't have ironically painted it on the side of an aeroplane that "delivered" bombs to the enemy.
Necrothesp