MEXICO CITY( Reuters)-Mexican President Andres Manuel Lopez Obrador said on Monday that an investigation was under way following an incident at the Mexico City International Airport( AICM), after a video reportedly taken over the weekend showed a plane almost landing on an already-occupied runway. Video of the incident, which appeared to show two jets from Mexican low-cost carrier Volaris nearly colliding, surfaced online days after a report from an international pilots association cited" severa