Hi mokham, MAPA is not a union. It's just an association among pilots within Malaysia Airlines. Most of the progenitors of the association are probably retired. The office bearers are elected from the general membership. There is no seniority per se, no official pecking order. Conditions and requirements for membership are like for any associations or societies subject to guidelines made out by the registrar of societies with the additional proviso that the intending member be from the ranks of pilots employed in MAS.