Why flight CMP358 is displayed as departed 22:44 EST and arrived 22:31 EST (arrival earlier than departure on Nov 8 and previous days) 
This results in a negative flight duration what is probably the cause for the n/a being displayed for the duration 
I think I should expect a shorter duration as the flight is coming from outside the area covered by FAA but not a negative duration.
It seems there is something to be investigated regarding such information.
Waiting for tips. Thanks a lot.
At least part of this flight occurs outside of FlightAware’s service area. Information on this page may be unreliable.
This happens quite often with flights originating in/departing USA air space. That’s why the wording in red above is on each international flight.