Mumbai, Jan. 11 -- International airport operators, including those of Zurich and Singapore's Changi airports, are evaluating India's plans to privatize six airports, according to two people close to the development. Other overseas entities that have shown interest include German airport operator Avi- Alliance, US financial investor Global Infrastructure Partners (GIP) and Sydney-based investment manager AMP Capital, the people said, requesting anonymity. Among Indian companies, Anil Ambani's Reliance Infrastructure, the National Investment and Infrastructure Fund and Adani group, besides Indian airport operators GVK and GMR, are likely to participate in the bidding, said one of the two people cited above. Six airports-Ahmedabad, Jaipur, Lu...