Rank One Starfighters
TIE Defender
E-Wing Starfighter
Skipray Blastboat

Rank Two Starfighters
TIE Advanced
Assault Gunboat
A-Wing Starfighter
B-Wing Starfighter

Rank Three Starfighters
TIE Interceptor
Scimitar Assault Bomber
X-Wing Starfighter
K-Wing Starfighter

Rank Four Starfighters
TIE Fighter
TIE Bomber
Y-Wing Starfighter
Cloakshape Fighter
A-9 Vigilance
Z-95 Headhunter

Use of Starfighter Rankings
The theory behind starfighter rankings is simple. Attacking at the same rank kills one fighter, down one rank destroys two fighters, down two ranks destroys six fighters, and down three ranks destroys twelve fighters. Attacking up any number of ranks gains you one fighter kill. Attacking with multiple squadrons is also simple. Just take the normal number of fighter kills and multiply times however many squadrons you are using.
Now, we run into the dilemma of squadron sizes. We solve this with another simple solution. Whenever a squadron drops by four fighters, it drops a ranking. Thus, if a Rank One squadron were to lose four fighters, it would be classified as a Rank Two squadron; another four losses would drop it to a Rank Three squadron. Please note, this means that a squadron can only drop two rankings, ever.

Capital Starships and Starfighters
Combat between capital starships and starfighters is an easily grasped subject. Starfighters assaulting capital starships uses the values assigned on the Weapons / Hit Points Chart. Thus, is very simple. Capital starships assaulting starfighters is very different, but not any more difficult. Each fighter is assigned a manueverability rating. This rating is used to dodge incoming laser fire from capital starships. You take the number of laser-type weapons fired, divide it by twice the fighter's manueverability, and that is how many fighters are lost. When using warheads, the starfighters manueverability is the rate at which it will dodge warheads.