The flat discount offer of Rs 999 is applicable for economy and economy plus tickets on all flights across the airline's network, Air Costa said in a release.
Incidentally, Air Costa rolled out the discounted tickets a day after the air passenger body APAI sought a ban by the aviation regulator DGCA on such schemes, terming them as "non-existent."
The booking of tickets under the five-day winter special offer commenced today for the travel period of October 27 till March 28 next year, the release.
"It is a constant endeavour to come up with exciting offers which give value to our guests. Our winter special offer will help our guests to plan and book their tickets in advance for the upcoming holiday season," Air Costa Managing Director L V S Rajasekhar said in the release.
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Domestic carriers, led by cash-strapped SpiceJet, have been rolling out one after another limited period "special sale" offers since January this year to woo passengers.
However, Air Passengers Association of India (APAI) alleges that most of the time airline websites show these low fares as "sold out."