Well, the answer is simple - Get rid of those silly little light twins, and have a sky full of M 0.85 - 0.86 747's. <img border="0" title="" alt="[Wink]" src="wink.gif" /> . .But seriously, I'd like to see some way of side-stepping so planes of any speed can climb out of the way of the slower/faster ones.. .Fast lane Boeing, slow lane Airbus.. .Dead simple, mate. <img border="0" title="" alt="[Smile]" src="smile.gif" />