From Scott Corrales The Journal of Hispanic Ufology Source 

An Japan Airlines Boeing 747-400 was surrounded by 20  spherical objects in the San Mateo Air Corridor in the vicinity of the  Satellite Towers in the state of Mexico. This report was provided to researcher  Alfonso Salazar by technical personnel of the MCIA who had direct access  to crew information. The airliner's registration number is JA-880.
The sighting took place on January 24, 2008 at 6:30 in  the evening, when the Japanese airliner flew the Vancouver-Mexico City  route.
The witnesses specified that the flying objects were  black-colored and divided into two groups.
It should be noted multiple encounters between UFOs and  airliners have been reported in this air corridor.
MCIA – Mexico City International Airport
(Translation (c) 2007, S. Corrales, IHU. Special thanks  to Ana Luisa Cid)