You can find detail about "Airnoise" at the following link. For the many who have commented on the increase in air noise on O'ahu, perhaps this may help.
https://www.washingtonpost.com/local/trafficandcommuting/button-offers-instant-gratification-for-those-plagued-by-airplane-noise/2018/12/29/c1035d32-02e1-11e9-b5df-5d3874f1ac36_story.html?noredirect=on&utm_term=.5847ac7a8633
We would appreciate feedback from anyone who tries this application/website.
A Quieter O'ahu