He makes the policy, and then the legislation or the regulations are created to reflect the policy decision. He makes the policy decisions in the international context in aviation because of various agreements and treaties.
In this provision, if I had to interpret it, I would argue it means that aeronautical activities are conducted at all times in a manner that meets the highest safety standards that are established. If the question mark is “by whom”, in the absence of anything else, it's the minister, so it's kind of circular.
To get back to the other provision being amended to say “paragraph (b)”, when you interpret the amending formula--the stuff in bold in the motion--in order to understand what that means you have to look at the act in force now. The effect of what you're proposing is that paragraph (a) in the existing act will be wiped out. Right now paragraph (a) reads, “promote aeronautics by such means as the Minister considers appropriate”. I question whether that's really your intent or whether you instead mean that “the portion of section 4.2 of the act before paragraph (a) is replaced by the following”.