I got from Airliners online news:
Delta Air Lines (Atlanta) introduced the new Boeing 747-400 ER on their transcontinental routes on November 1. The first official flight took off as DL1169 from Atlanta to San Francisco with N831MH. The new type is gradually replacing the remaining TriStars. In other news, the company will add nonstop Boeing 757-200 flights from the Cincinnati hub to San Juan on December 1.