AirPods accounted for 85 percent of the money spent in the U.S. on wireless headphones since they debuted, research firm NPD Group estimated last year.
https://www.bloomberg.com/news/articles/2018-02-22/apple-is-said-to-plan-upgrades-to-popular-airpods-headphones(http://www.autoadmit.com/thread.php?thread_id=3903201&forum_id=2#35480855)