Although the maximum number of seats in a one-class configuration is 156, common airlines which use this aircraft configure it like this;

British Airways (2-class, European) : 126 seats - 48 business + 78 economy.

Air Berlin (1-class) : 144 economy seats.

Easyjet (1-class) : 156 economy seats.

Although the maximum number of seats in a one-class configuration is 156, common airlines which use this aircraft configure it like this;

British Airways (2-class, European) : 126 seats - 48 business + 78 economy.

Air Berlin (1-class) : 144 economy seats.

Easyjet (1-class) : 156 economy seats.

all they are is buisness class has better quality than second class does

"Advantage to flying business class over economy is as follows:

Economy class.