Given the lack of business class seats in the CRJ-200, which has only 50 seats in an all-economy config, I'm wondering if the CRJ-700 and -900 could be fitted with business class seats?
Note that the CRJ's economy-class seating is 4-abreast, or 2-2 across the cabin, so business class, if possible, might be 1-2 or 1-1 abreast. The CRJ-700 is a 70-seat version, while the CRJ-900 would be able to seat 90. Both of these figures are in all-economy class.
Not surprisingly, airlines and passengers seem to complain that the CRJ doesn't have business class seating. I hear this often about Air Canada's CRJs, for example.