I was around MSP about 12:45 PM, and saw a KLM 747-400 landing. It flew over our car, and made a quick whining noise for about 3 seconds, then it stopped, and the plane flared for landing a few seconds later. Have you ever heard that noise before it lands?? Also, when did KLM quit the 747-300 service for 747-400 service on AMS-MSP??