Behaviour combined with location on the map are often good indicators online, maybe offline too. Planes usually fly high and fast over enemy territory, lower and slower (taking off and landing) when they feel safe over their own land. If you see a plane arriving high from the direction of the enemy base, or running away low towards an enemy base, then it's almost certainly an enemy. Online, they usually won't let you chase them in a straight line deep into your turf, they will want to turn back towards help.
Specific plane types are often flown in a specific way too: 109's boom and zoom with a very steep climb at the end, 190s boom and zoom in more shallow angles, Spitfires and Zeros do impressively fast horizontal turns.
It's hardest to identify a plane if you're just chasing a lonely dot along the front-line.
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