From The International Air Transport Association…..

In the month of December global international cargo traffic plummeted by 22.6% compared to December 2007. The same comparison for international passenger traffic showed a 4.6% drop. The international load factor stood at 73.8%.

For the full-year 2008, international cargo traffic was down 4.0%, passenger traffic showed a modest increase of 1.6%, and the international load factor stood at 75.9%.

“The 22.6% free fall in global cargo is unprecedented and shocking. There is no clearer description of the slowdown in world trade. Even in September 2001, when much of the global fleet was grounded, the decline was only 13.9%,” said Giovanni Bisignani, IATA’s Director General and CEO.” Air cargo carries 35% of the value of goods traded internationally.

There is all this from The American Trucking Associations….

The American Trucking Associations’ advanced seasonally adjusted For-Hire Truck Tonnage Index plunged 11.1 percent in December 2008, marking the largest month-to-month reduction since April 1994, when the unionized less-than-truckload industry was in the midst of a strike. December’s drop was the third-largest single-month drop since ATA began collecting the data in 1973. In December, the seasonally adjusted tonnage index equaled just 98.3 (2000 = 100), its lowest level since December 2000. The not seasonally adjusted index edged 0.6 percent higher in December.

(h/t Calculated Risk here and here)