Aircraft and Night

[Blackcloud6]

I cannot  find anything in the 4th Edition rules that say how night affects aircraft.  Is there any such rule?

I ask this because in Conquest of Ethiopia Special Rule 13 says to apply the Dawn and Dusk time table in that rule to all scenarios.  Therefore, Scenario 2 would have dusk at 1800 hours with night in effect from 1745 to 1915, the end of the scenario.  But the scenario special rules allow the Italian player to draw aircraft all the way to the end of the scenario.  

I would think that night would at least affect the spotting roll.