Dubai has restricted foreign airlines to just one daily flight to its airports until May 31 due to the Iran crisis, igniting revenue loss fears among Indian carriers that had planned more flights than airlines from any other country, letters show, reports Reuters.

The Federation of Indian Airlines (FIA), which represents top carriers IndiGo, Air India and SpiceJet, has asked India to push Dubai authorities to lift the curbs and, failing that, to consider reciprocal measures on Dubai carriers, including Emirates and flydubai, according to a letter it sent to the Indian government on March 31.

Indian carriers are already under financial pressure from higher fuel prices and longer routings to Western destinations because they have been banned from using Pakistani airspace since last year, following military tensions between the two neighbours.

In a private email to airlines on March 27, seen by Reuters, Dubai Airports said carriers would be allowed one round trip per day to Dubai International Airport (DXB) and the smaller Al Maktoum International Airport (DWC) during the summer season between April 20 and May 31, extending restrictions implemented after the war began.