The index was trading 0.91 per cent up at 16199.27.
India's largest IT services firm said its shareholders have approved its up to Rs 16,000 crore share buyback plan.
"The company expects 737 Max to return to operations by Q1 2021. Once 737 Max returns to operations, SpiceJet could start receiving incentives as part of the sales and lease back agreement," said HSBC.
SpiceJet traded 3.15 per cent higher at Rs 55.70 at around 2.17 pm (IST), while the benchmark BSE Sensex was down 0.69 per cent at 43,293.
The airline said that the total income was Rs 1,305 crore for the reported quarter as against Rs 3,074 crore in the same quarter last year.
SpiceJet and its promoter Ajay Singh were asked to deposit around Rs 243 crore as interest payable on Rs 579 crore, which the high court had in 2017 asked the airline to deposit under the 2018 arbitration award in the share transfer dispute.
The seaplane flights will be operated by SpiceJet's subsidiary Spice Shuttle. The duration of each flight would be around 30 minutes.
The Gurugram-headquartered airline will operate four times a week non-stop flight services between Kolkata and Chittagong, besides connecting Delhi, Kolkata and Chennai with Dhaka, a release said. Chittagong, the port city, will be the 11th international destination of SpiceJet, it said, adding that all the new services will be operated from November 5.
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