The BART-Oakland airport connector has been in operation for 6 months. And now that we are entering the peak summer flying season, it is a good opportunity to look at actual ridership numbers.
The OAC replaced the AirBART bus service. The baseline bus ridership was 2100, although ten years ago it was much higher (around 3500 average weekday trips). This gives (at best) a net gain in transit ridership of 1,000 daily trips — a dismal result for a capital project costing $500 million.