Mr. X Welcomes You Aboard The LZ 129 Hindenburg!!!
Congratulations. You are one of the few prize-winners amongst a world-wide raffle! You shall experience the maiden flight of Luftschiffbau-Zeppelin's newest and most prized airship, The Hindenburg.
...That's the official story, but if one can trust psychics and fortune-tellers (Why not?) they tell a more chilling tale.
According to them, Mr. X is a secret agent of the Gestapo and is using pure Aryans to invite aboard and then assassinate key-people of other races! At the same time, the other races have been informed by their own dictators that this invitation is an opportunity to also assassinate the other races. Neither knowing the other's plan.
On one flight in the future the crystal ball for-sees fights getting particularly rough and someone... somewhere... thought it a good idea to use a flare gun, in the rear of the ship.