Sydney: Singapore Airlines (SIA) said it would review capacity on some routes if the global credit squeeze continues to hurt the global economy, and warned rising fuel prices remained a major challenge.

"Fuel remains a very challenging factor for us. Of more concern is the credit market squeeze. The state of the global economy will have an influence on traffic flows," SIA chief executive Chew Choon Seng told Reuters in an interview yesterday.

"We would have to crank in some flexibility in our forward plans in terms of capacity among various routes around the world."

The airline, which last week raised fuel surcharges for passengers, planned to maintain its fuel hedging requirements at 40-60 per cent as crude oil prices threaten to hit $100 per barrel, he said.