I'll answer quickly and then turn it over to my colleague John.
Our principal concern about anything with respect to ATC, air traffic control, and navigation is with respect to safety and safety of operations.
You do absolutely look at the coverage you're going to get and the times of day you'll get coverage and whether your alternates will actually be covered in order to fly service, so it can have a commercial implication, but ultimately you're most focused on safety and the provision of safety services. I think that comes back to my earlier comments about Nav Canada needing support.