In plane infested areas, I'm usually cruising around at TC about 500 to 1000x. When a plane is sighted, I step it down to 8 or 16x while I figure out where he's headed. I'll step it down to 8x if he's approaching the danger radius, leave it at 16x if he's going to pass harmlessly by and leave it there until he's at least 10 miles off, going away. Then I resume 500 to 1000x.
If I have to dive I leave it at 8x, hit the dive key (not crash dive) in time to be at or below periscope depth as he crosses the line, start the stopwatch, step up to 16x until 5 minutes are up, hit "s" to surface and after I'm surfaced I'll go back to 500 or 1000x.
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