Everything is heavily automated right now up to and including autopilot landings. The people are in the loop to cover the gaps where automation doesn't exist or when it fails. Everything is so tightly scheduled at airports now that any kind of failure in automation would pretty rapidly lead to catastrophic outcomes if humans weren't constantly involved in decision making. Even if you just had humans on "stand by" it would take to long to get them up to speed on the context if things went sideways.