Back in the 1970s , before Euroccontrol moved to Maastricht and when we still used paper strips, blue for Westbound, buff for Eastbound (and red for dangerous according to our
PR expert) a few of us were taking our break in the terminal building at Zaventem when a couple of Sabena CC walked past, one in beige and one in blue. their then current uniforms. Someone wondered out loud why two different uniforms. "Easy," answered a French colleague. "Blue for westbound flights, beige for eastbound."