As I return to the civilian world, and try to gain some comprehension of the FARs, I did have these questions:

1) With reference to a fractional jet operating under FAR Part 91 (K) 91.1039, are IFR weather mins and climb gradients DIRECTIVE or not? (Which sounds like an interview question to me...)

2) Why do fractionals sometimes operate Pt 91 and sometimes Pt 135?

Any help appreciated.

Zach