MX-21 Black and Gold Wireless Headphones $29.99 
$39.99 USD
Over-ear noise cancelling starts with a cushion that seals around the ear before any electronics run. That passive seal blocks the higher frequencies, and the active circuit works on the low steady ones underneath — engine drone, train rumble, a fan.
Neither part does much about a voice in the next seat. Speech sits in the range that survives both.
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