Real first class air still exists. You can find it (at a huge cost) on international flights especially those run on certain Middle Eastern and Asian airlines. Domestic first class, though, is an endangered species on the major airlines. However, there's a growing business in fractional ownership bizjets, and "clubs" that are really small airlines like Surf Air. Major points of the tiny lines are first class treatment including minimal security hassles all along the line, operation from smaller airports that are usually closer to where the high-end travelers want to to, and small (dozen or so seats) planes with nice trimmings. Surf even has a monthly pass (several thousand $$).

There have been several attempts at doing real first class passenger rail in the U.S., but most have died or become a tack-on to an Amtrak train. It's nice to vacation by private car, or even on Iowa Pacific's occasional City of NO section, if you can afford it, but long-distance travel for the well-to-do is almost always by private jet these days. Amtrak itself calls sleeping accommodations "first class" but the current cost-cutting program has eliminated some of what made it special while maintaining or increasing prices - that and poor schedule-keeping on key trains will eventually come around to bite Amtrak.