I also had severe problems with spotting planes. I'm not talking about the LoD issue, where contacts suddenly disappear at a certain distance, but I didn't see contacts at all. The only times I actually saw something was the Me-109 zipping by after she's hit me...
It turned out that my so-so pc apparently wasn't capable of running CoD properly on my monitor's native resolution (1920*1080), without notifying me in any way - after setting the game to a lower resolution (1600 or 1400), I've seen much success with spotting planes, and keeping them in sight, lately.
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