The SWISS A319-100 has 138 seats. The standard SWISS cabin layout is 42 standard Business Class seats and 96 standard Economy Class seats. Note that Business Class seating is the standard Euro Business 3-3 arrangement with the middle seat blocked for additional personal space (yielding 28 available seats for selection).
The number of Business Class seats may increase or decrease depending on demand.
SWISS uses the aircraft type on flights within Europe, as well as, flights from Switzerland to Africa and the Near East.