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How to guess it?
Many people guessed Iberia correctly for a few simple reasons: the flight attendants' uniforms, the colors on the fuselage of the plane on the lower right picture, the walls on the reservation agent's desk, and the text identifying this airline as the second most important European airline. The mailing list members also had a clue: this airline never appeared before on any Guess The Airline game before.Amazingly, several people guessed airlines other than European, and airlines which didn't even exist in 1980.