currently the Alt+F2 cameras in game are 5. The location of each camera relative to the aircraft can be found in the folder :
IL-2 Sturmovik Battle of Stalingrad\data\LuaScripts\WorldObjects\fixcameras\Planes
they are saved in the relative .txt files.
For most aircraft, there is a way to increase the number to 11, by adding info using the same code structure and increasing the number of the "attach=100" all the way up to 110. This way you can get more possibilities for c