What weightlessness feels like on Zero-G planes

Skydiving you only get a little 'light' right at exit (from airplanes anyway) because your moving out into horizontally fast moving air; and begin to instantly decelerate (horizontally) as you start accelerating vertically. Once you reach terminal velocity (see Wikipedia), your not weightless at all... as experienced in the wind tunnel. Far as exits from hovering helicopters and balloon's go, your for all practical purposes weightless until you develop a little air speed... but said time period is very short.