Reuters Shares of Space Shuttle Contractors Fall Monday February 3, 10:43 am ET CHICAGO (Reuters) - Shares of space shuttle contractors Boeing Co. (NYSE:BA - News), Lockheed Martin Corp. (NYSE:LMT - News) and Alliant Techsystems Inc. (NYSE:ATK - News) fell on Monday, the first trading day after the Columbia shuttle disaster. ADVERTISEMENTAlliant, which builds the solid rocket boosters for the shuttle, tumbled nearly 12 percent, its biggest one-day point loss since its October 1990 debut on the New York Stock Exchange and its biggest percentage loss since January 1993. Credit Suisse First Boston downgraded Alliant stock to "neutral" from "outperform."...