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In Baghdad, top U.N. weapons inspectors Hans Blix and Mohamed ElBaradei say they are encouraged by what they say is a distinct change in Baghdad's posture toward disclosure. NPR's Jacki Lyden talks with NPR's Anne Garrels.

Maine's Senate passes a resolution urging further diplomatic efforts in Iraq. More than 50 municipalities have passed similar resolutions, and several other state legislatures are considering them. Fred Bever of Maine Public Radio reports.

In an effort to reduce costs, American Airlines asks its unions to make concessions worth nearly $2 billion annually. The Fort Worth, Texas-based company also closes two reservations offices and announces 750 flight-attendant layoffs. Bill Zeeble of member station KERA reports.

NPR's Joe Palca reports that NASA has sent teams to California and Arizona to expand its ground search for debris from the space shuttle Columbia. Large pieces, possibly one or more engines, have been located in Louisiana. The loss of Columbia is forcing NASA to reevaluate the future of the international space station. The space station is not in immediate danger, because a Russian supply vehicle docked with it yesterday.

A week after it posts the largest loss in corporate history, AOL Time Warner works to get back on its feet. But the media giant, which lost nearly $100 billion last year, faces large debts left over from its earlier mergers. NPR's Jim Zarroli reports.

NPR's Wade Goodwyn reports that more than 10,000 people attended the memorial service yesterday for the seven astronauts that was held at the Johnson Space Center in Houston. In his remarks, President Bush remembered the crew members as explorers, as well as scientists.

Laura McCallum of Minnesota Public Radio reports on the efforts of Minnesota's new governor, Tim Pawlenty, to drastically cut the state's spending in order to adhere to his "no-tax increase" campaign pledge last November.

NPR's Richard Harris reports that NASA is dismissing the theory that the primary cause of the space shuttle Columbia disaster was damage from a piece of foam insulation that broke off and struck the shuttle during liftoff. NASA is instead focusing on overheating inside the left wing during reentry into the Earth's atmosphere and reviewing the last seconds of data from the shuttle.

NPR's Chris Joyce reports on what NASA learned from a study conducted after the space shuttle Challenger blew up in 1986 and what the findings might tell investigators about the disintegration of the shuttle Columbia on Saturday. A 1994 study by the engineering firm SAIC concluded that, aside from engine failure, the highest risk for a space shuttle is not from damage to heat protective tiles, but rather from failure of the auxiliary power units. The APU's run the hydraulics that, in turn, control steering during reentry into the atmosphere.

NPR's Anne Garrels talks with Bob Edwards about Baghdad's reaction to Secretary Colin Powell's presentation at the United Nations.