Geography (minimizing flights) continues to be a consideration by the selection committee (more than 400 miles drive is a flight). But it is not the lone consideration. They also have the mandate to balance the regionals as much as possible. This is why all regional placements are not "bus" optimized as they were after 9/11 and in 2021. That is ... while they want to maximize bus travel, they will sacrifice this for balance if it makes sense. So you may have a field that could optimally result in X teams utilizing bus travel, but the committee elects to have X + 2 teams utilizing bus travel in order to achieve more balanced regionals.
Brian