tl;dr: gray is a good camouflage color against clouds or haze, which is a fairly common background for aircraft operating at mid to high altitudes.
(The logic is fairly similar to what results in Navy ships being painted haze gray and not azure blue or whatever color the ocean happens to be today)
tl;dr: gray is a good camouflage color against clouds or haze, which is a fairly common background for aircraft operating at mid to high altitudes.
(The logic is fairly similar to what results in Navy ships being painted haze gray and not azure blue or whatever color the ocean happens to be today)