Determining altitude visually is impossible. You could easily go wrong. That's why there are altimeters present in all aircrafts.
An odometer is for distance travelled, not height. You need something sensitive to changes in atmospheric pressure, a barometer, for measuring altitude. Altimeters as fitted to aircraft are in effect barometers.
Cruising altitude is an economical height for an aircraft to fly. It is also a choice made in view of other aircraft routes.
Aircraft typically arrive at an altitude of around 30,000 to 40,000 feet to operate and fly.
The service ceiling of an aircraft is the maximum altitude that the aircraft can safely maintain.
the vagna 137
The diference is simple, the transition altitude is the altitude above sea level at wich the aircraft change from the use of altitude to the use of flight level. When operating above the transition altitude, the aircraft altimeters pressure seting is normally adjusted to the standard pressure setting wich is 1013 millibars in europe, or 29.92 inches of mercury in US, or Canada. There the aircraft altitude will be expressed as a flight level.
Acceleration altitude in aviation is the altitude at which a pilot begins to increase the aircraft's speed after takeoff. This is typically done to accelerate the aircraft to a safe climb speed and improve performance. It is an important phase of flight to ensure the aircraft gains sufficient speed for a smooth and efficient climb.
An altitude gauge is an instrument that measures the vertical distance above a reference point, usually in relation to sea level. It is commonly used in aircraft to provide pilots with information about the altitude of the aircraft in flight.
this obviously varies.
The vertical distance of the aircraft above the surface.
35,000ft (A380-800, initial cruise altitude). The service ceiling (maximum altitude) of this aircraft is 43,000 ft.
They vary by aircraft type. Howver, a 737_800 max altitude is 41,000 feet