LONDON — Airlines are avoiding Syrian airspace as the United States and other Western powers consider their response to a suspected chemical attack near Damascus last weekend.

The European Aviation Safety Agency, a European Union organization, issued an alert on Tuesday, prompting a number of airlines to steer away from the country’s airspace.

“Due to the possible launch of airstrikes into Syria,” the agency said, “due consideration needs to be taken when planning flight operations.” The alert cited the possible use of air-to-ground and cruise missiles and the likely disruption of radio navigation equipment.