The ratings are also supported by most of the airport's traffic being origin and destination, as well as India's favourable demographics and consumers' increasing propensity to fly.
"We believe DIAL's business strength supports its access to domestic banks and capital markets to address its short-term liquidity needs and refinancing plans", the rating agency added.
The airport is the largest international airport in India. It handled about 67 million passengers in FY20 with transit passengers making up only about 20 per cent of total traffic.
"We expect passenger travel to recover once the economy rebounds in the medium term, following a sharp drop due to the Covid-19 pandemic", Fitch said. The airport is located in the National Capital Region, which has a catchment population of over 22 million.