"The budget carriers have captured a lot of market share but one has to ask how profitable are they and are the growth plans that some of them have realistic," IATA Director General Tony Tyler told journalists ahead of the Singapore Airshow.

The Geneva-based group said profitability for Asian airlines in general was weak compared with other regions.

IATA represents almost 260 airlines accounting for 83 percent of global air traffic, nearly all of whom are legacy flag carriers rather than purely low-cost operators.

The Geneva-based group said profitability for Asian airlines in general was weak compared with other regions.

Southeast Asian budget carriers have ordered hundreds of jets from Airbus (>> Airbus Group) and Boeing (>> Boeing Co) in recent years, turning the region into one of the biggest markets for airplane manufacturers.

"It's easy to place these orders when times are looking good," Tyler said, adding that he would not be surprised if some of the deliveries were pushed back. "And I'm sure that the planning departments of all these airlines are now studying their orders in the context of what the market is telling them."

Tyler said turbulence in financial markets had impacted global premium traffic.

He said that while the overall Chinese economy had slowed down, air travel in the country remained robust as the country seeks to shift its economy away from capital investment and towards consumer spending. "We are seeing still reasonably strong traffic within and into and out of China," he said.

In December, IATA forecast that low oil prices and healthy demand for travel would boost global airline profits again in 2016.

(Editing by Tim Hepher)

By Anshuman Daga

Stocks treated in this article : Airbus Group, Boeing Co