All airliners have rows of seats missing where the emergency exit doors are.
30 in an all economy layout with the max number of seats, otherwise it depends on the airline
The standard seating plan of the Airbus A319 is for 24 rows of six seats, three seats either side of a central aisle.
252
3.
30 rows in an all economy layout and less for airlines with extra leg room and or first class
It depends how many representatives there are
2
Seats 18D and 18E on the Airbus A319 are (based on if the aircraft has a 3-3 seating configuration) -5 rows from the rear from the aircraft (just behind the wing). -18D is an isle seat and 18E is the centre seat in that row.
According to the lady that answered the phone for Guest Services at American Airlines Center, most rows have 18 seats in them.
8 seats 4 rows 2 on each seat
42 seats