While doing some research on the Y-Wing and TIE models, I came across some thing interesting in the Chronicles book on page 110:
"Though it's the Rebel Alliance's older attack starfighter model, the Y-wing is a rugged, single-pilot craft, though one model also carries a weapons officer."
So there you go. Keep an eye out for the model with two pilots. It also lends to the theory that the Y-Wing originally had two pilots and may have been upgraded at some point to an automated system possibly controlled by an Astromech.