Ramjets work with an air intake speed of, usually, 400mph+ but scramjets require supersonic air speed to function.
It depends on the model of the Royal Air Force fighting jet that you are asking about. But the Eurofighter Typhoon jet, has a top speed of 1,320mph.
It depends entirely on the speed of the jet.
A Scram jet is a jet which needs supersonic propulsion to take off. It is taken into air by another larger aircraft and is released in supersonic speed.
Jet streams gain speed due to the temperature and pressure differences in the atmosphere. As air moves from areas of high pressure to low pressure, the Coriolis effect causes it to deflect, creating a fast-moving band of air called a jet stream. Additionally, the presence of the polar front jet stream at the boundary of cold polar air and warm tropical air can also contribute to high wind speeds.
Has no pilot.
Propulsion is what keeps a jet in the air. Otherwise the plane has to fall down. Propulsion keeps the air always flowing over the wing which in turn keeps the plane afloat.
Jet Streams
it depends what jet.
According to the Encyclopedia of World Air Power the fastest fighter jet is, The F15: Mach 2.5, approximately 1,400 mph.
Jet streams give off chemicals that penetrate the air and trickle down to where we breathe. Streams also affect the weather because of the jets high speed, potentially causing storms and tornadoes if two jet streams intersect.
air and combustion gasses moving at great speed and elevated pressure.