Plane Overhead

Being directly under the landing path of a plane is kind of cool.  Here's one coming in and flying directly overhead.

Something very interesting happened shortly after it passed over. A kind of whistling sound almost like rushing wind crossed with a a rope or cable whipping (or trailling) through the air came over. No wind, though that might be expected.  And it lasted longer than it took for the plane to pass overhead.  A short time later a breeze came past, but nothing really strong. Another plane went nearly overhead and the sound was there but much less so. Another plane and no sound...