I have PlanePlotter and can possibly assist.
The server transmits data every 60 seconds from memory, so yes it is real time, as real time can get I suppose. In between transmissions of data the aircraft continue to proceed onsceen. PlanePlotter predicts their course based on the last information supplied. So for example if say QF12 was traveling 360 at FL200 at 444 kts the program will continue plotting the aircraft on that track at that speed at that altitiude until the next transmission comes in 60 seconds.
Dont forget, only ADS-B enabled aircraft appear on PlanePlotter, aircraft who don't have this you will obviously still hear on your scanner but not see on screen. In your settings make sure you check all the boxes so that PP displays all aircraft at ALL altitudes and increase the time the trails stay on screen. When I get home I'll do a screen dump of my settings screen and post it for you so you can make sure yours are the same.
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