Seems a strange choice as a replacement for the 146, the 146 is quite a "self sufficient" aircraft which had it's own stairs fitted and didn't require ground handling equipment to load or unload baggage whereby the A321 is much bigger, looks like it requires external steps, will require a baggage loader & will require longer runways
Surely the BBJ MAX, which is compatible with P8 and P7 with a cargo door would have been more suitable, built in steps, no baggage belt required and great range. In addition if a cargo door was fitted it could be used for the aeromed role?