India's domestic passenger traffic slipped to a 10-year low at an estimated 53.4 million in the just-concluded financial year, a report said.However, in the previous fiscal there were no passenger flight operations for almost two months due to the pandemic-induced lockdown.During the financial year 2010-11, all domestic air operators together had flown a total of 53.8 million passengers on local routes, according to ratings agency ICRA.The domestic passenger traffic in March 2021 has been estimated at around 77-78 lakh, a marginal decline of about 1 per cent over February during which airlines had flown around 78.30 lakh passengers, it said.For FY2021 (May 25, 2020 till March 31, 2021), domestic passenger traffic has been pegged at around 53.4 million, a year-on-year decline of about 62 per cent over the fiscal ended March 31, 2020, in line with ICRA's estimates, it said.Domestic passenger traffic in March 2021 has been estimated at around 77-78 lakh, implying a flat growth on a y-o-y basis on a low base of March 2020 (which had witnessed a y-o-y decline of 33.1 per cent in domestic passenger traffic) as domestic travel was affected with effect from March 25, Icra said.Domestic passenger traffic witnesses a flat year-on-year growth in March 2021 owing to low base, Icra said, adding the recent spike in cases poses challenge for sector's recovery.The airlines' capacity for March 2021 was around 2 per cent higher at around 71,300 departures than 69,910 departures in March. On a sequential basis, the number of departures in March 2021 were higher by about 11 per cent, Icra said.