I took VS231 at the end of July. AUS is the only US airport I've been to where you collect your checked luggage before going through immigration. Therefore the wait was at baggage claim rather than immigration. Once bags had arrived, there were 2 or 3 immigration officers so it only took a few minutes to get through. I can't remember 100% but I think it was about 20 minutes for bags to arrive once I was at baggage claim. It was only the VS flight waiting; I think BA was cancelled that day.