This part of the law is about how carriers (like airlines) can work together. You need to know two things:

1. Carriers are allowed to make special agreements with each other if they want to. The law doesn't stop them from doing this.

2. If carriers have rights or duties towards each other, this law doesn't change those. Their relationships with each other stay the same.

So, this law gives carriers the freedom to work together in ways that suit them, while also making sure that their existing relationships aren't affected.