MUMBAI, May 23 -- The Indian subsidiary of Turkish ground-handling firm Celebi Aviation Holding on Wednesday approached the Bombay high court to challenge the Indian government's revocation of its security clearance, which resulted in the termination of its agreement at Mumbai's Chhatrapati Shivaji Maharaj International Airport (CSMIA). Celebi Nas Airport Services India has filed an arbitration petition urging the court to issue directions to restrain the airport authorities from appointing a new company in its place. The petition was filed days after the Mumbai International Airport Limited (MIAL), which operates CSMIA, terminated its agreement with Celebi and appointed Kolkata-based firm Indo Thai Airport Services on a temporary basis for three months until it finalises a long-term partner. CSMIA was among several airports across the country that terminated their agreements with Celebi earlier this month. This was after the Bureau of Civil Aviation Security (BCAS) revoked the Turkish firm's security clearance. Meanwhile, the Centre told the Delhi high court on Thursday that the security clearance of Celebi Airport Services was cancelled due to a potential threat to the country's airports under the prevailing circumstances in the country. It also said that disclosing the reasons behind the government's actions would have "defeated the purpose" of the very action sought to be taken. P6...