Phantom upgrades were an unpublished program which no one from NWA management ever acknowledged as existing. I guess, they realized, the good times for us were coming to an end and they gave us a farewell gift. At the time I was a PE ( had been for 8+ years ) and I got Phantom upgrades DTW-AMS, DTW-FRA. I remember, that both times I was unceremoniously called to the podium to receive my WBC boarding pass. I thanked the agent and expressed my sadness about the upcoming merger. Thanks NWA, I will always remember that gesture of appreciation. Never flew DL!