Major airlines have two pilots and expensive avionics. But “commercial aircraft” refers to all aircraft with paying passengers, including Cessnas with a single pilot that take a few passengers sightseeing. As I said, fatalities are extremely rare in any of these flights.
And all pilots are guided by air traffic control, from major airliners to solo private pilots. Air traffic control is meant to prevent mid-air collisions, an air traffic control system that ignored small aircraft would be pointless.