I suggest watering the plant thoroughly, so it can absorb as much water as possible.
After a couple of days, unpot it and remove all of the potting medium. If the plant will be exposed to high heat in-transit, surround the roots loosely with moist (not "wet") sphagnum. If it will not, leave it dry.
Surround the entire plant with a thick layer of shredded paper. It is both mechanical padding and thermal insulation. Then wrap the entire thing in several more sheets of paper, totally enclosing the plant.
The plant may arrive a bit dehydrated, but it shouldn't be so extreme to be a major issue.
If that plant has to cross any national borders en route, I hope you have the proper permits and documentation.
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