Answer:
Horses that need to be transported overseas or over long distances can be shipped via plane. The plane has to be altered to accomidate such a large animal but stalls are erected toward the back. Air travel for the modern equine can be nerve-racking. If the horse is not used to flying it may be necessary to sedate him, either before or during the flight.
*In the movie Internation Velvet starring Tatum O'Neal they show a somewhat graphic scene of a horse that 'freaks out' during a flight. If you get a chance check it out.