I don't know if it was the elite upgrade that let it happen or if this is a permanent glitch in NW's system, but I got onepass miles on a cybersaver trip.

Date of Transaction Type Description Mileage Earned or Deducted Bonus Total Mileage Earned
1/15/01 Air NORTHWEST 1112 FU YUL DTW 529
SILVER ELITE BONUS 264 793
1/13/01 Air NORTHWEST 1143 FU DTW YUL 529
SILVER ELITE BONUS 264 793