Ash from Popocatepetl volcano disrupts flights
US airlines have cancelled flights into and out of Mexico City for a second day over fears that ash from a rumbling volcano could affect their planes.
Delta and United Airlines were among the companies that stopped at least a dozen flights on Friday.
On Thursday, more than 40 flights were cancelled, leaving hundreds of passengers stranded.
Popocatepetl volcano has been rumbling all year, and began spewing ash and steam earlier in the week.
Airport authorities insisted there was no danger.
An unnamed airport official told the AFP news agency: "There is a very thin presence of ash, which does not harm operations or affect equipment."
Frustrated passengers have been forced to wait for hours at Mexico City airport
But Jorge Andres Gomez, a spokesman for the airport, said any change in the wind or intensity of the volcano would complicate the situation.
Photo of Popocatepl courtesy SunSurfer.
Read more at BBC News.