RJ'sThis is the first route where US has really taken B6 "head on." When you think about it, there are very few routes where US and B6 compete on (only LGA-FLL, BOS-RIC, BOS-NAS, BOS-PIT come to mind... did I miss any others?)
The fact that BUF-BOS must be a profitable route for US shows that they arent afraid to take on B6. I think BOS-PIT will also see an increased US presence, but not the other routes.