The MLAs, who signed the petition included AICC secretary V D Satheesan, M V Shreyams Kumar (SJD) and T N Prathapan (Cong), known as "green" legislators.
One of the MLAs, C P Muhammad (Cong) later clarified that he did not sign the memorandum though he shared the concern of his colleagues over the ecological threat posed by the proposed airport, being developed by an investors' consortium KGS Group.
A local resistance group called Aranmula Heritage Protection Council, which has the support of various political parties and cultural outfits, has been campaigning against the project arguing that vast stretches of paddy fields will be lost if it is allowed, causing serious environmental problems.
The promoters of the project, however, rejected this contention holding that much of the land acquired for the airport has been lying fallow for decades.
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They have justified the need for the airport on the ground that area has hundreds of NRIs working in various parts of the world and is also close to Sabarimala temple, which attracts devotees from all over the country and abroad.
A copy of the petition has also been forwarded to UPA Chairperson Sonia Gandhi, they said.