The ARJ21 is only useful to Chinese, NK, and Russian based airlines it seems. Any airline in a western country (or country with good relations with the west) would go for the Boeings, Embraers, and Airbuses of the world over Comac. But I do think that the SpaceJet could end up having a good role. For its seating capacity and its theoretical fuel burn rate, at the unit cost it's at, it could end up being a major player in the "short, regional hopper" market.
Personally, if we're going to end up having all aircraft of a certain family at some point, the "Airplane" tab can be streamlined to simply have collapsable lists of families instead. Instead of seeing four Airbuses from the same family separated, it would be neat to have them bunched up into a collapsable that says "A320 Family" or something. Same for the 737.
But then you have to ask, what of all the other one-off planes who're left alone? Like the B763ER for example. Then it might just be better to have each airplane manufacturer have their own list... but then you wind up having to do more clicks to compare one plane to another...
What were we talking about again?