I'm just making an educated guess here.

Baiting(short term just prior to survey) Survey Area would concentrate deer in a smaller area. Might also allow for more survey/flight time over selected areas. Does this bait simulate seasonal food crops??

Conducting Fly Over during dayligt hours while most deer are bedded down might make perfect sense if you wanted to be more precise in your data over a specified area. Adding the bait to the daylight survey would make even more sense.

Being much larger than little ole Delaware,I'm sure its more difficult to get one on one,face to face info from an informed source(DNR/F&W). I would certainly try to find that source if I hunted up there.