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What are these transparent slides?

Posted: Sat Jul 07, 2018 8:35 pm
by JAGflyer
Someone posted these on Reddit and were wondering what they were. They show airport codes, aircraft (B727, B320?!) and Y/F (economy/first class). I'm not sure what exactly they were used. My only guess is for projecting information in an airline reservation center. Can anyone shed more light on what these may be?