I did do that as I've already said in my post...That's what E + End is for, I believe. All of the mission zones are created over Steelport, so using them leaves them there until you do E + End, but make sure you do it before an activity, as it may also delete the activity's mission zone.
 
				 
 
		 
 
		 
	 
 
		 
 
		 
 
		 
 
		 
 
		
 
		
![[V] IdolNinja](/forum/data/avatars/m/0/62.jpg?1394026296) 
 
		