N.Y. Business Corporation Law § 903
(a) The board of each constituent corporation, upon adopting such plan of merger or consolidation, shall submit such plan to a vote of shareholders in accordance with the following:
(2) The plan of merger or consolidation shall be adopted at a meeting of shareholders by (i) for corporations in existence on the effective date of this clause the certificate of incorporation of which expressly provides such or corporations incorporated after the effective date of subclause (A) of clause (ii) of this subparagraph, a majority of the votes of the shares entitled to vote thereon or (ii) for other corporations in existence on the effective date of this clause, two-thirds of the votes of all outstanding shares entitled to vote thereon. Notwithstanding any provision in the certificate of incorporation, the holders of shares of a class or series of a class shall be entitled to vote together and to vote as a separate class if both of the following conditions are satisfied: