I guess my point wasn't to get mired down into how each company breaks out their pay rates, but to point out that although UAL doesn't operate any 321s, if they did, they would pay the same as a 757...which makes sense because the 321 is almost the same size as the 757.

Most of the 757-200s seat right around 200 pax. Our A321s seat 187...close enough in my book. You'll also notice that UAL's 737-8 rates are the same as the 757, for probably the same reason.