ever heard of TIBA ??
you might be interested to learn that lots of countries operate RPT jets OCTA without tower/radar.
Here in Saudi Arabia we operate daily/nightly with A320/E70/MD90 and occasionally B777/B747 acft, into a multitude of small country airports.
There are at least a dozen that have neither tower or radar, and only a Fire Rescue Service to liaise with for traffic. Happy landings !