Airplanes are becoming more like helis, using variable-pitch-propellers (VPP). This style of flying is one step above "3D" flying, and is rightfully also known as "4D" flying.
<![CDATA[<div><embed type="application/x-shockwave-flash" src="http://www.youtube.com/v/fhCOHF24kRc&ap=%2526fmt%3D18&rel=0" width="425px" height="344px" wmode="transparent" quality="high" allowFullScreen="true" allowScriptAccess="never" pluginspage="http://www.macromedia.com/go/getflashplayer" autoplay="false" autostart="false" /><noembed><a href="http://www.youtube.com/v/fhCOHF24kRc&ap=%2526fmt%3D18&rel=0" target="_blank">http://www.youtube.com/v/fhCOHF24kRc&ap=%2526fmt%3D18&rel=0</a>]]> 
