Ariz. Rev. Stat. § 29-2204
A. A plan of merger of a domestic merging entity may be amended either:
2. By the governors or interest holders of the entity in the manner provided in the plan except that an interest holder that was entitled to vote on or consent to approval of the merger is entitled to vote on or consent to any amendment of the plan that will change any of the following:
B. After a plan of merger has been approved by a domestic merging entity and before a statement of merger becomes effective pursuant to section 29-2205, the plan may be abandoned by the domestic merging entity, subject to any contractual rights as follows:
2. If not provided in the plan, either:
C. If a statement of merger has been delivered for filing with the appropriate filing authority, the plan of merger may be abandoned only if the statement of merger sets forth a delayed effective date under section 29-2205, subsection B, paragraph 4. Such a plan of merger may be abandoned by delivering for filing with the appropriate filing authority on or before the delayed effective date a statement of abandonment, signed on behalf of each merging entity. A statement of abandonment takes effect on delivery for filing, and the merger is abandoned and does not become effective. The statement of abandonment must contain all of the following: