Originally Posted by
Fiordland
It is an interesting question. Had they gone for for the A220-100 I would say it was a E190 replacement. The A220 in the AC configuration is between the A319 and A320 in seats. Delta went with a mix of 100 and 300 aircraft.
Replacing the E190 with A220-300 probably is an indication the E190 is a bit on the small side for what AC needs today.
The 223 is not much smaller than the 320. Quite a bit more than the 319. OTOH the E90 was based upon a flawed business model and never really belonged. But they seem happy with the mix of CR9s and E75 for the regionals.