And how much cargo is carried on the domestic route structure? You cant compare the A320 and E170, they have completely different route structures and mission profiles.
Within Saudi Arabia, there are airports which must be served as part of a public service obligation (PSO), SAMA and NAS got their licences on the premise that they would operate some of these routes. Unfortunately for them they chose the B737 and A320 as their initial aircraft, neither of which are suited to operate most of these PSO routes. Hence the reason NAS got the E190 and SAMA started operating a Jetstream 41, both airlines have since dropped the PSO routes due to their economics......
We looked very closely at the 737 and A318/9 before buying the E170. The new A320/1 fleets were never intended to replace the E170, rather its intended to replace the MD90 entirely and the B777 on certain routes. The fleet commonalities of the A318/9 still wouldn't justify putting them on the PSO routes.
However, SVA have a significant domestic route structure.... GF has none! Hence the passengers have completely different requirements regarding luggage.
Mutt