Austin, isn't representative of anything except a confluence of factors combined with stupidity.
First, its a ~30 min flight to Houston, and a ~40 min flight to Dallas, two of the largest and busiest hub airports in the USA. So, a massive amount of american/united Austin traffic is Austin->IAH/DFW->destination if your not flying southwest with a direct route. Yes, there are a number of direct routes to other places, particularly large hubs (DEN/ATL/JFK/etc) but its like once a day or every other day for non hub airports.
But that pattern is doubly reinforced through local decisions which have resulted in ABIA being the number #1 airport in the USA for flights per gate.
AKA, by gate count it has the highest utilization of any airport in the USA, and this is the result of the anti-growth politics for the past 40+ years, that did things like move the airport from Mueller, to ABIA while initially planning on having the same number of gates as Mueller, and only relenting and adding 4 (IIRC) more. And keep in mind that Mueller was frequently like going to a crowded standing room only bar. And not only was ABIA undersized but it wasn't designed for serious expansion. And really, there wasn't any excuse when one looks at any airport designed in the past half century its obvious where the terminal expansion is planned (ex:DFW) with the better designed airports like TPA/MCO using a hub and spoke model. Instead what Austin is going to get is an ad-hoc expansions which will result in Heathrow levels of suck (and its already that way for the south terminal, where one has to leave the airport, drive for 10 mins and then re-enter).