Airbus A320 Whistling Sound

Last week, aircraft landing at SFO were routinely passing over my house at ~10,000ft. Some of these aeroplanes  made a ghostly whistling noise for 5-10 seconds, and I used Plane Finder app to identify them as the Airbus A320. I don't mind the brief whistle noise. But what's causing it?

A320whine.com has the answer, and Airbus has the solution to eliminate this noise.

 "The noise is caused by air passing over circular vent holes under the wing, similar to the wind blowing over a bottle – just a much larger scale. These annoying wailing sounds good be heard on the ground ... "   -A320whine.com

"The President again made unfounded statements about...."

(I want to read that as the first sentence of a news article)

I live in California , and get my news from foreign news sources. The best domestic journalism is being done by comedians, such as Samantha Bee.

Journalists do not have to defer to politicians. And they must stop struggling to find the sense and reason in statements made by politicians who are not concerned with the truth of what they are saying.