CaughtInThe
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You're making an empirical claim - masks are essentially useless on a plane. Do you have any evidence for that claim?
There is contrary evidence. E.g. Still Confused About Masks? Here’s the Science Behind How Face Masks Prevent Coronavirus | UC San Francisco
and, tbh, it doesn't even matter if they are or aren't (all the way from your car to leaving your destination's airport).
IT'S DELTA'S POLICY. That's all this is about.