More airlines to re-route flights and avoid airspace over Iraq and Iran:

Vietnam Airlines said it is re-routing its flights away from the Iranian and Iraqi airspace from Wednesday.

Russian Federal Air Transport Agency Rosaviatsia told Russian air carriers to avoid civilian and transit flights in the airspace of Iraq, Iran, the Gulf and the Gulf of Oman.

Meanwhile, Germany's national carrier Lufthansa also cancelled its daily flight between Frankfurt and Tehran on Wednesday, citing the situation in Iran. A spokesperson said that Lufthansa was also halting its next scheduled flight to Irbil in Iraq on Saturday.

China Southern has cancelled Wednesday's flight from Urumqi to Tehran, the carrier said.