BFS gets an A321-200 (Y220 config) from May-Oct, apart from a couple of weeks in late May / early June when an A320 is scheduled. Also An A330-200 doing BFS-MIR on Wednesdays and some peak season SFB/POP (A332 & A333) and DLM/TFS/AYT (B752/B753/B763) flights.
The SSH flights start again in September, also operated by B752, but the main BFS schedules are operated by the A321 this summer.