Conversation so far:
what is the top speed of a 747
The Boeing 747 to 400, the most common variant in service, has a high-subsonic cruise speed of Mach 0.85 to 0.855, up to 570 mph or 920 km/h.
what is a 747
The Boeing 747 is an American wide-body, long–range, commercial jet airliner and cargo aircraft.
does the 747 have any other names
The first wide-body airplane produced, the Boeing 747 was the first plane dubbed a Jumbo Jet
who manufactured the 747
The Boeing 747 was manufactured by Boeing's Commercial Airplane unit in the United States.

Question: when was the aircraft's first commercial flight
Self-contained rewrite: when was the 747's first commercial flight