Among dozens of requests I was successfull as follows:

1) AMS-BKKrt: 2 Business class seats, in 2001, don't remember exact dates
2) Mid-May 03 ZRH-AMS-LAXrt, 1 seat in coach class
booked late March 03.
deemed successful due to low bookings at onset of Iraq war
3) Beg. of Dec 03: SFO-AMS-SFOrt, 1 seat in business class
booked Sept 03
deemed available due to past-Thanksgiving/pre X-mas season.

Looks like availability decreased even further in 2004.