The usual suspects top the list of the most profitable companies in 2006, ranked by Fortune. Your friend and mine, Exxon Mobil, again headed the pack.

The oil giant racked up $39.5 billion in earnings last year, the largest-ever profit in U.S. history. That figure topped the previous record of $36.1 billion, also set by Exxon Mobil, in 2005. Profits were up 9.3% from the previous year, while sales rose 2.2%.

The rest of the top ten included:

2. United Airlines
3. Citigroup
4. Bank of America
5. General Electric
6. Pfizer
7. Chevron
8. Conoco Philips
9. J. P. Morgan Chase
10. AIG (American International Group) Insurance