3 aircraft and 4 cabin layouts, from the 737 MAX 8 to the 737-900ER. Pick one for its seat map, the best seats and the seats to avoid.
There are seat maps for 3 Smartwings aircraft here: the Boeing 737 MAX 8, the Boeing 737-800 and the Boeing 737-900ER.
The Boeing 737-900ER, with 212 seats: 212 Economy in its main layout.
