I can see Aircraft with tail no VT - AKU on my ADSB viewer but same is not available on live Flightaware flights view. Are there any filters applied between what data ADSB is streaming and actually displayed?
I plugged that tail # into the aircraft search in the FA header which returned:
The flight is blocked. Check the Flightaware FAQs for information on how and why this happens.
I hope this helps.