An unspecified number of flights have been diverted from Mexico City because a power failure darkened the capital's international airport.
Airport managers say power and flight service is expected to be restored before midnight.
Officials say the apparent failure of a transformer threatened to start a fire at the facility. But they stress that passengers and planes were never at risk.
The airport hasn't said how many incoming flights were diverted to terminals at Acapulco, Veracruz, Monterrey and elsewhere in Mexico as a result of Wednesday's outage.