Any way to make FSX change the default aircraft,

I mean I know where aircraft.cfg is but just can't find where in the file for the zoom change.

I think this is what you want.

http://www.ehow.com/how_8726896_change-default-flight-fsx.html

The only flaw of that link is: there is no Make this the default flight" check box at the end, so nothing achieved.

#11 Click the "Make this the default flight" check box.

OR: https://forum.flyawaysimulation.com/forum/topic/27291/default-flight-and-how-to-make-fsx-not-load-one/

Just can't find this button chief! It's not existent on my FSX. Weird 🙄

When you get to the "Free Flight " screen, the one with the spinning aircraft in the window.
Look below and there are 5 buttons, one says "save".
At the bottom of the save window is "make this the default flight".