What does the idle airplanes parked in the ground with their users Last online information displayed means? Is it some kind of new feature?
It is! It’s called fleets you can learn more here!
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I think you might be referring to the fleet mode aircraft (Those that are parked at some gates and or cargo hold areas that say (Parked)
You can read more about those on this article here 
Have a good day.
he beat me to it.
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See topics linked above