Not an option under current FAA rules. The available optical sensors are still generally inferior to human eyes in terms of dynamic range, depth perception, and slew rate. The US military does fly remote-piloted aircraft (Predators being the most prominent example) but they're only allowed to operate in limited pieces of designated airspace due to the risk of midair collisions.

Communications reliability and latency is a problem. We still have no way to guarantee solid bidirectional comms. The mishap rate for RPVs is much higher than for comparable manned aircraft.