Just saw an aircraft with the size of an A319/A320, but I did not recognise the airline so I looked it up on flightradar24. And it just showed the registration/plate and basic data like ground speed and barometric altitude, but no airline/owner and suprisingly no picture. I dug a little deeper and found a flight history of it on Flight Aware. It recently made multiple flights with a duration of about half an hour from and to one regional airport/strip...
@MagicLike Research aircraft maybe?
@catraxx maybe 
@MagicLike Or maaaaaaaaybe ... ALIENS! 
@catraxx or mayybeeee the russians 
@MagicLike WÄNÄÄÄÄH, ECKAAAART