The years of employment of a certificated teacher who has been employed by a school district for more than the major portion of three consecutive school years shall be preserved if such teacher transfers from a common school district to a high school district or from a high school district to a common school district if the governing board recognizes the previously established years of employment of the transferred teacher, provided such districts have coterminous boundaries and have a common governing board.
A.R.S. § 15-547