As of this minute... (Not sure of what the benefits are yet for benefit year 2001):
- Upgrades confirmable at time of booking from Y,M,B,H,V,T fares for both domestic and international.
- Blackout dates waived for award travel for you and a travel companion.
- 24/7 Exclusive SE desk
- Concierge service
- Gurantee seat if booked 6 hrs prior to departure even if flight is overbooked.
- 4 bags checkin allowance
- Free upgrade to next category room at Fairmount hotels.
Those are the major ones off my head and I think they are the major benefits of being a SE.