They used to bus them but that got photographed and documented.
Then they used commercial airlines (no masks, no ID) and when reporters caught on to that they used military bases where no reporters could access. We don’t know if the military is flying them or not.
The images that Tucker Carlson showed may have been cherry picked, but they showed plane loads of military age men. Not one woman or child, or old guy that I recall. All military age men.