Four US airlines temporarily suspended flights to and from Mexico City after a volcano near the capital spewed ash on July 4. According to Reuters, three to eight flights on American Airlines, U.S. Airways, Delta Air Lines and Alaska Air Group have been postponed so far. No Mexican airlines have halted operations.
The Popocatepetl volcano has been more active this year but officials have so far ordered no evacuations. The volcano’s risk level is kept at “yellow”, which is the second highest on the four-colour spectrum, indicating that there is more activity than usual but no threat of eruption.
This animation explains how volcanic ash is damaging to an airplane.