A TX attorney I’m acquainted with has used a high end bus line to go from Austin to Dallas IIRC. Might have been these guys:
If you want high end, no TSA it private security, with valet or door to door black car service from Austin to Dallas JSX is the way. They pick you up at home in a black Yukon drop you at the FBO and you walk with your luggage to the lounge have a complementary single malt and they come there for your luggage when it’s time to board you walk to the jet get on and then fly direct to another private FBO they bring you your luggage and the black Yukon takes you to your hotel. Only about twice as expansive as business class on commercial cattle car and OOO so worth it.