DELTA in recent schedule update gradually adjusts planned Northern Winter 2016/17 operations, from 30OCT16. As of 18MAY16, the preliminary winter schedule sees further downsize to planned 747-400 operation, including the following routes:
Detroit – Seoul Incheon
Detroit – Shanghai Pu Dong
Detroit – Tokyo Narita – Manila
The 747-400 operates 1 daily flight each for routes listed above. Further adjustment is highly possible.