NEW DELHI, April 30 -- A tariff cut meant to ease airline costs is squeezing India's private airport operators, who are warning of cash-flow stress and seeking temporary relief from revenue-sharing obligations.

The Association of Private Airport Operations (Apao), which represents 14 public-private partnership airports, has written to the civil aviation ministry flagging that the mandated reduction in landing and parking charges "is likely to materially affect the airport operator's immediate cash flows, debt repayment ability and operational sustainability."

Mint has seen a copy of the 30 April letter, signed by Apao secretary general Satyan Nayar. Airports under the association include those operated by Adani, GMR, Zurich Airport Inte...