The international airport of the central Mexican city of Puebla has been closed since Friday morning due to falling ashes from nearby Popocatepetl volcano.
By mid-morning Friday, two flights had been canceled - United Airlines to Houston and Aeromexico to Monterrey.
A meeting of the security committee is planned for the next few hours to determine whether climatic conditions will allow the airport to reopen so the approximately five flights scheduled for today can take off.
Officials at Mexico City international airport, 79 kilometers (49 miles) from the volcano, said that operations there have not been affected because winds from Popocatepetl on Friday were blowing toward Puebla.
On Thursday, the monitoring system for Popocatepetl volcano registered 45 exhalations accompanied by constant emissions of steam and gas, Mexico's Cenapred disaster-management agency said.
Last Saturday authorities raised the volcano alert to Stage 3 Yellow after an increase in volcanic activity that caused a shower of ash on Mexico City.
Popocatepetl, Mexico's second-highest peak at 5,452 meters (17,875 feet), is one of 14 active volcanoes in the Aztec nation.