It’s possible! In conjunction with Iberia and American Airlines, British Airways is currently offering some excellent Business Class fares for travel between Dublin and various cities within the United States!
Example round trip fares;
Atlanta – $1,576
Austin – $1,631
Chicago – $1,576
Dallas – $1,632
Denver – $1,631
Miami – $1,576
Nashville – $1,576
New Orleans – $1,576
New York – $1,529
Pittsburgh – $1,576
These appear to be the key rules governing these fares:
Travel outbound on Tue/Wed/Thur (the better deals appear to be limited to departures on Tuesdays and Wednesdays)
Travel inbound on Mon/Tue/Wed
Reservations are needed at least 180 days before departure (the better fares appear to be available from September onwards)
The minimum stay appears to vary between 6 and 7 days for the best fares.
The maximum stay length is 12 months / Other rules may apply.