The new cabin class, however, will be for the first time introduced on select flights to Sydney from Singapore on August 9, and it has already commenced bookings for the Australian route, a release said here.
This will subsequently be made available to other destinations served by the airline's Airbus A380s and Boeing 777-300ERs, in addition to the future fleet of Airbus A350s, it said.
The premium economy on the India routes will be introduced on the jumbo Airbus 380, which the airline operates on its Delhi and Mumbai routes.
Currently, newly launched Vistara, in which SIA holds 49 per cent stake besides 51 per cent by Tata Group, is the only carrier in the country with premium economy class on its flights.
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The new cabin class will be progressively introduced to other sectors, including Beijing, Hong Kong, Frankfurt, London, New York, Shanghai, Tokyo and Zurich in the latter part of 2015 and early 2016, the release said.
"We have been heartened by the highly positive public reaction to our new premium economy class since our plans were announced last year...We are confident it will be well received by travellers who are looking for more features," Singapore Airlines Chief Executive Goh Choon Phong said.
Singapore Airlines, along with its low-cost arm SilkAir, operates 92 weekly flights from 11 cities -- New Delhi, Mumbai, Kolkata, Chennai, Bengaluru, Ahmedabad, Kochi, Hyderabad, Coimbatore, Visakhapatnam, Thiruvananthapuram.