As I see it, the Airport Authority did it right this year to try to avoid a big stink.(though it still happened)They did state they will re-evaluate after the first of the year. True it sucks and is PC but I guess that's the world today.
Next scenerio for you: The Airport Authority re-evaluates and decides to incorporate all major religons into various displays throughout the airport. Now what's to stop the Jehovah Witness's or other religon from claiming discrimination because they don't celebrate Christmas?