The parties to the arbitration (the East pilots and the West pilots) "ratified" it when, through their respective MECs, they agreed to submit to binding arbitration in the first place.
If there is some sort of additional requirement that the parties somehow had to "approve" the award before it became binding on them, please share it (i.e., please quote the specific language you are referring to and share its source). Otherwise, according to well-established arbitration law, when parties agree to go to BINDING arbitration, it means just that - the outcome is BINDING on the parties.
But believe what you want to.