I have looked for a long time for an option such as key_released but have seen nothing in 3DGS. How can I make something happen when a key is released???
PLS HELP!

while (key_a) wait(1);

This wait till you release the key a

so for example if I want my plane to tilt to 0 (my.tilt=0;) once the player lets go of key_a how can I make that happen. I know its easy but I just cant get to find the right stop for the part.

Try something like this:

if(key_a)
{
while(key_a){wait(1);}
vec_lerp(my.pan, vector(my.pan, 0, my.roll), my.pan, 0.1);
}