A person who hijacks, through the employment of violence, threats or other illegal means, an aircraft in use or controls its flight shall be sentenced to death, life imprisonment, or imprisonment for not less than seven years.If the offense is light, he shall be sentenced to imprisonment for not more than seven years. If an offense results in death, the offender shall be sentenced to death or life imprisonment.If an offense results in serious physical injury, the offender shall be sentenced to death, life imprisonment, or imprisonment for not less than ten years.