A Mysterious 747 Jumbo Jet Has Been Spotted Flying Low Over US Cities. A bizarre sighting has been reported in several major US cities, with a Boeing 747 jumbo jet flying low and slow through the skies. The jet, which has been identified as a 747-400, has been seen flying over cities such as New York, Los Angeles, and Chicago, leaving many onlookers stunned and wondering what could be behind the unusual flight path. As the Federal Aviation Administration (FAA) scrambles to investigate the incident, theories are emerging about the possible reasons for the jet's unusual flight, ranging from a publicity stunt to a potential issue with the aircraft's navigation system.