Close-up view of a double smoke trail visualizing the wing-tip vortices created by the T-28 stunt plane featured in our previous image.

Photo taken during the "Airfest 2007" air show at MacDill Air Force Base in Tampa, Florida.

[© "Ernie" - photo shown with permission (more images of these unusual smoke trails can be found at ernienotbert.blogspot.com/2007/04/airfest-2007-part-eleven.html and at www.herb-ditto.com)]