I posted this question on the Civil Aviation thread:
I have noticed that 767s make a whooshing/growling sound on descent when passing overhead. I was recently on an HA 767-300, and heard the same sound. Unfortunately, I was sitting in the center section aisle seat, though I did have a chance to notice the flaps deploying peering through the window. Has anyone ever heard that sound either inside or outside? I know that we were at 6,000 to 8,000 feet when this sound occurs, and it wasn't the landing gear being lowered.
In Honolulu, I have noticed that all variants make that sound. AC 762s; AA, HA, UA, & 5X 763s; and CO & DL 764s fly into and out of HNL.
Maybe it was the aircraft farting due to the airline food.