Commercial airlines around the world on Monday were weighing how long to suspend Middle East flights after the U.S. struck Iran. Singapore Airlines, one of the highest-profile in Asia, had called the situation "fluid" on Sunday as it cancelled flights from Singapore to Dubai following a security assessment.

"While there have been no specific threats made against civil aviation, Iran has previously warned it would retaliate by attacking US military interests in the Middle East – either directly or via proxies such as Hezbollah," Safe Airspace said.

Authorities warn that U.S. carriers are at greater risk as global airlines reroute around conflict areas and fuel costs climb