US-Mexico Flights Canceled Over Volcano Fears Popocatepetl spewing ash, steam, glowing rocks By Newser Editors and Wire Services Posted Jul 4, 2013 5:17 PM CDT 30 comments Comments Lava flows from the Popocatepetl volcano after an eruption, seen from Tlamacas, Mexico, early Wednesday, May 15, 2013. (AP Photo/Arturo Andrade) (Newser) – At least six US airlines canceled more than 40 flights into and out of Mexico City and Toluca airports today after the Popocatepetl volcano spewed out ash, steam and glowing rocks, airport officials say. A Mexico City airport spokesman says US Airways, Delta, United, American, and Alaska Airlines canceled 47 flights as a precaution. But he said the airport otherwise continues to operate normally and that by this afternoon no ash had reached the area, about 40 miles from the volcano. Authorities registered several tremors today at the 17,886-foot volcano, which has been spraying a fountain of hot rock and ash for the last 24 hours.