With all seats occupied I seriously doubt a mask will to any good. You are breathing the same recycled air for the entire flight and you are setting shoulder to shoulder. I read an article a few years ago that it requires a compressor to bring in fresh air into the cabin at cruising altitude and the more new air brought into the cabin requires more energy to run the compressor. More energy requires more fuel, more fuel means more money. If airlines were required to seat people 6' apart I don't think they will fly any planes because they will lose too much money. They would lose less money grounding their planes as there would be no need for air crews, plane maintenance, no airport fees and no fuel costs.
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