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In-flight smoking became so antiquated that airlines started replacing light-up ‘no smoking’ signs with a non-illuminated placard. With smoking prohibited at all stages of flight, it was unnecessary to always illuminate a sign, unless a regulator stipulated as such. Besides practicality there was aviation’s legendary bean counting: removing the lightbulb does away with cost, weight and complexity. “Cases of smoking in cabin seats have become much more common,” Korean Air says in a statement. [...]