bmi British Midland have 2 based A330-200s for the daily IAD and ORD flights. Timings are:
BD701/702 (to/from IAD)
Departs: 12:45
Returns: 05:55
BD705/706 (to/from ORD)
Departs: 10:40
Returns: 08:00
Also, Air Jamaica fly the A340-300 in on Wednesdays and Saturdays from Montego Bay / Kingston.