The base metals had a uniformly terrible day Thursday, as spot prices for copper, nickel, zinc, aluminum, and lead all tumbled. Copper dropped quickly throughout the day’s trading and finished down 6 cents, at $3.6968/lb, despite a mid-morning rally. This represented a six-week low in copper prices.

The base metals were mixed on Tuesday. Copper shot up at the New York open, briefly touching the $4 mark and, despite experiencing a late morning dip, rallied to finish just short of it at $3.9866/lb., up nearly 3 cents.

Delta Air Lines Inc. (DAL) and Northwest Airlines Corp. (NWA) are now officially one company, and together now represent the world’s largest airline carrier.