1500 ft
During IFR flight, ATC will dictate cruising altitude.
it's altitude should be whatever is economical for that flight
We will fly a VFR flight heading 245 - what is a legal cruising altitude?
It can be calculated at any altitude - including negative ones - eg under water.
This question does not provide enough information to be answered.
1,500 feet AGL.
It will vary by country. For example, in the US the minimum visibility is 3 miles.
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.
I'm sure that this question means altitude. Altitude is vertical distance between the maximum or minimum of the ocean wave (or any wave) and halfway between the minimum and maximum. Half the vertical distance between the minimum and maximum of the wave.
Normally, participants in a hypobaric chamber exercise are restricted from flying for a minimum of 12 hours. However, it really depends on the altitude achieved in the chamber and the duration at altitude.
200 miles(: