As for the ooooh aaaa effect, you could argue that vapor trails on high alt bombers could give you a more accuate idea of whats up. ie direction, speed, size, not to mention that its just easier to spot a trail then to spot a spot.
But i think it would be a waist of time for HTC to do because there are so many other better things they are working on.
for now if you want trials just drop a tab before you log....
JUST JOKING!
-AKog