Here is what the Policy Manual states with regard to MEMRAT as defined in the ALPA By-Laws.:

B. Ratification of Agreements
1. MEC Ratification Policy:
a. Collective bargaining agreements that have been approved by the MEC
and result from negotiations undertaken pursuant to both Section 28 of the
PWA and Section 6 of the Railway Labor Act that both resolve all Section
6 issues and conclude Section 6 negotiations shall be subject to
membership ratification. All other agreements shall be subject only to
MEC ratification unless the MEC determines that an agreement should be
subject to membership ratification.