Actually, the majority of the 763ER fleet has two overwing exits (rows 20 and 21) as WidgetBoi mentioned. However, lately, they have been showing the seatmap of the ex-GF/OZ a/c (ships 1501 - 1506 and ship 1521) for all 763ER flights "to be safe". The ex-GF/OZ a/c only have 30 seats in BizElite (5 rows) as opposed to 36 seats on the reg. ERs and as they never really know which specific a/c will be operating a particular flight until the day before or the day of departure, they tend to block out row 6 in BizElite for pre-assignment. The Y seat map also shows the config for the GF
/OZ planes (hence the one exit row). If you check the seatmap on the day of departure, it will show 2 exit rows again if it's a non-GF/OZ a/c. The GF
a/c have rows 16 and 17 which do not exist on the regular ER
while row 20 remains the one exit row.