Are the economics of the SSJ that it can make money on routes unprofitable for, say. a 319?
I'm not privy to any industry data but the SSJ is said to slot between the E-190 and E-190E2 ( lower ) in terms of CASM. So cheaper to operate per seat than an A319 but if you can put a bigger aircraft on a route and fill it then you'll make more revenue, linearly.