Some major airlines were re-routing flights on Wednesday after Europe's air traffic control agency warned aircraft flying in the eastern Mediterranean to exercise caution due to possible air strikes into Syria.
Eurocontrol said in a notification published on Tuesday afternoon that air-to-ground and cruise missiles could be used over the following 72 hours and there was a possibility of intermittent disruption to radio navigation equipment.
US President Donald Trump and Western allies are discussing possible military action to punish Syria's Bashar Assad for a suspected poison gas attack on Saturday on Douma, a rebel-held town that had long held out against regime forces.
A spokeswoman for Air France said the airline had changed some flights paths following the warning, including for Beirut and Tel Aviv flights, while budget airline easyJet said it would also re-route flights from Tel Aviv.
Trump on Tuesday canceled a planned trip to Latin America later this week to focus on responding to the Syria incident, the White House said.
Trump on Monday warned of a quick, forceful response once responsibility for the attack was established.
The Eurocontrol warning on its website did not specify the origin of any potential missile threat.
"Due to the possible launch of air strikes into Syria with air-to-ground and/or cruise missiles within the next 72 hours, and the possibility of intermittent disruption of radio navigation equipment, due consideration needs to be taken when planning flight operations in the Eastern Mediterranean/Nicosia FIR area," it said, referring to the designated airspace.
Aviation regulators in countries including the United States, Britain, France and Germany have previously issued warnings against airlines entering Syrian airspace, leading most carriers to avoid the area.
The only commercial flights above Syria as of 0115 GMT on Wednesday were being flown by Syrian Air and Lebanon's Middle East Airlines, according to flight tracking website FlightRadar24. At other periods later in the day, there were no flights using the airspace.
Eurocontrol included a broader area outside the airspace controlled by Damascus in its statement.
A spokesman for Germany's Lufthansa said on Wednesday its airlines were aware of the Eurocontrol warning and were in close contact with authorities.
"As a proactive precaution, Lufthansa Group airlines have already avoided the airspace in the eastern Mediterranean for some time now," he said.
Ryanair and British Airways representatives said flights were operating normally at their respective airlines, but the situation was being monitored closely.
