Monarch A330,
Oxford had 34 ex-students go British Airways in 2006. And a fair number already this year: 47 (BA and BA Citiflyer).
I'm currently at OAT and, so far, it's been very good. Ok, so the management are not at all well-organised but they've delivered what they've promised (eventually, in terms of information). Of course, only time will tell if they live up to their reputation but, of my friends who've been through OAT, I've heard no complaints.