30-35,000 feet
Bombers fly above a certain altitude (higher than a normal plane), that's why you can not hear them.
Normal altitude refers to the typical height above sea level at which an aircraft flies during a flight. For commercial airplanes, cruising altitude ranges from 30,000 to 40,000 feet. Smaller aircraft typically fly at lower altitudes, between 5,000 and 10,000 feet.
480 kts
At altitude the Eurofighter flies at about 1,320 mph.
30 to 40 thousand feet
it is a deviation from the normal change of atmospheric properties with altitude
This depends on the region, altitude and month of the year.
In my opinion, 200 feet of altitude, either higher or lower, from the normal baseline altitude of the person, will have little to no affect on breathing or pulse.
high altitude chambers
TREV
The cruising altitude of a normal commercial jet airplane today is around 12,000 m (35,000 ft).
122 normal 120 high altitude