Airship Guide

[Nyalia]

Is there any way to obtain more favourable ratings? Most of my airships ratings are B and C.

The letter grade shown is just based on the sector rating you received from the last sector you visited. Abysmal = C or B, Substandard = B or sometimes A, Satisfactory = A or rarely S, Decent = S or very rarely SS, Outstanding = SS. Only the last sector matters for the letter. But, as others have said, that letter means/does nothing.

But, if you do want to get higher letter grades for some reason, there are two things you can do. First, your per-sector rating goes up on average as your Favor stat goes up. Second, your per-sector rating goes down as you visit later sectors. Your best chance to get an SS rating would be to visit sector 01 last with a Tatanora Forecastle. Your worst chance would be to visit sector 16 with a Bronco Forecastle, or sector 22 with an Enterprise Forecastle (you need at least 90 surveillance to visit sectors 17-22). So either raise your Favor, or go to earlier sectors, or both.

Do I have to do anything specific to unlock Sector 13, 14 & 16? I have 11 & 12 unlocked and have been doing them with a Full Enterprise Build and I haven't unlocked anything beyond Sector 12.

Sectors 13 and 14 unlock from 11. Sector 16 unlocks from 12. Other than that, it's pure RNG.