Low-cost carrier Cebu Pacific announced Tuesday that it has adopted the "Happy Hour" concept for the sale of at least 100,000 seats across its domestic and international portfolio.

"We assure the public that there will be more than 100,000 seats available for this promotion; and even if our seat sale is available at a specific time, our online booking facility remains robust to accommodate as much as 500,000 concurrent users at the same time," Cebu Pacific Vice President for Marketing and Promotion Candice Iyog said in a statement.

Cebu Pacific said it is charging a 'Go Lite' one-way fare of P299 for all domestic flights and P599 for all international flights except for Osaka, Japan. 'Go Lite' fares are for passengers with no check-in baggage. Those with check-in bags have to add P200 to the fare.

The said fares exclude value-added tax and government taxes (about P35) for domestic flights. Travel taxes (P1,620) and terminal fees (P750) have to be paid on top of VAT and government taxes for international flights.

This is a non-refundable promotional fare available only for those buying their tickets from May 13 to 15 on Cebu Pacific's specified "Happy Hour" time slots (from 11 p.m. to 2 p.m., and from 5 p.m. to 8 p.m.) and who will travel from September 1 to 30 this year.

The Gokongwei-led airline reported a 28-percent growth in passenger traffic for the first three months of the year, bucking the gloomy economic trend in the aviation industry, which reported a 10-percent drop in February alone.

Cebu Pacific said it ferried 1.97 million passengers from January to March, higher than 1.54 million in the same period last year.