By Russell Grantham, The Atlanta Journal-Constitution Knight Ridder/Tribune Business News
May 7--Delta Air Lines' shares dropped below $6 Thursday, hitting not only a 52-week low but also the lowest price in at least 23 years.
Delta's shares dropped almost 6 percent, to $5.76, amid a broader decline on Wall Street because of worries about future interest rate boosts and continued high crude oil prices.
Thursday's price, Delta's lowest since at least 1980, pushed its stock market capitalization to about $714 million, lower than that of much sm