You don't just bring prisoners on public transportation if that's what you're suggesting. From a pure liability perspective, no commercial airplane is going to just accept him as a passenger.
Friends, this isn't the mastermind of an accounting fraud. This is someone accused of murdering 4 people with a knife at close range stabbing them all multiple times. He's not going to sit in the exit row chatting with grandma about his PhD thesis, complaining about babies crying on the plane.
I hate to break it to everyone, but law enforcement is not the most efficient group around and sometimes they just have to put an arrested allegedly violent and dangerous person on a dinky little plane that needs an occasional pitstop.