Popularity for low-cost travel in Thailand and Vietnam is set to increase no-frill operations this year, a new study found.

According to a CAPA Aviation Analysis, Thailand’s two main low-cost carriers (LCC) Thai AirAsia and Nok are both planning to expand their fleet by up to 33 percent this year, which will be used to on both domestic and international services.

Thai AirAsia plans to welcome nine new aircraft this year for a total of 36, while Nok is expected to add six aircraft for a total of 24.

Meanwhile, Vietnam is expected to start catching up with other Southeast Asia markets, with operations expansions for Jetstar Pacific and the launch of Vietjet’s international flights in February 2013.

The analysis also found that although Vietnam is “ideal for LCCs”, the sector currently only has 21 percent penetration rate.