Unless you're one of those aviation junkies, (That describes 99.9999999% of us on this site) you probably don't know a 737 from a CRJ. All that most people know it that it is an airplane, and it gets them where they need to go, whether it from NY to LA, or Boston to Seattle, most people don't book their flights for aircraft types, they book for the best fare they can get. Now having been a non-rev in the past, I honestly did choose most of my flights based on the aircraft type being used. When I worked for AirTran, I tried to avoid the 737s because I really don't like the three abreast seating, because it's a pain in the butt unless you have a row to yourself. When I worked for ASA, I flew nearly ever type of aircraft Delta flies, with the exception of the 737-800 and the MD-90 (neither aircraft were flying the routes at the times I wanted to fly) I basically booked my trips with aircraft types in mind. I tried to get most of my flights on widebodies because I would be more likely to get seated in Business Class than I would on a narrowbody. I only ever flew in Business Class in a narrowbody on Delta twice. But for the typical traveller, the aircraft type for the most part is irrelevent to them. As long as the flight's on time, and doesn't crash, that's alright for most passengers.