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The B-47 Stratojet had 6 engines, but is no longer in service.
At least one(!), the biggest planes have six.
At least one(!), the biggest planes have six.
There are no aircraft of any kind that currently fly on six engines.
Spruce Goose
It depends on the size of the aircraft. A smaller airplane like Cessna has only one engine. The biggest cargo plane like Antonov has six engines.
It can have any number of engines of as many different types as needed. For example the B-36 bomber was originally designed with six radial 28 cylinder piston engines driving pusher propellers. Later four small jet engines were added, making it the airplane with the most engines of any mass-produced aircraft ever built. For some airplanes optional jet-assisted takeoff or rocket-assisted takeoff drop away engines can be added for increased thrust at takeoff without extra weight of those engines while in the air in normal flight.
In the military, "got your six" means "I've got your back." The saying originated with World War I fighter pilots referencing the rear of an airplane as the six o'clock position.
This is completely variable. Airplanes have been built with as few as one engine to as many as ten engines (the only airplane with this many ever built was the B-36 strategic bomber having six 28-cylinder Pratt & Whitney R-4360 'Wasp Major' radial engines and four General Electric J47-19 jet engines).
About six hours by airplane.
It doesn't. The engine burns for as long as its application demands. A RATO used to accelerate the takeoff of an airplane runs for maybe a minute or so, the Shuttle's main engines only for around six minutes.
It takes approximately six hours to travel by airplane from New York to England.