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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.

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.

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.

Marty Mankamyer resigns as president of the U.S. Olympic Committee, amid infighting within the organization. Mankamyer's feud with Olympic chief executive Lloyd Ward prompted hearings last week in the Senate, and concern that politics overshadows athletes' efforts. NPR's Howard Berkes reports.

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

In December 2001, alleged members of the terrorist group Jemaah Islamiyah had a plan: bomb the U.S., Australian and Israeli embassies in Singapore, steal and fly a jet into the terminal at Singapore's Changi airport, and attack a visiting U.S. warship at Singapore's naval port. Singaporean authorities stopped the plot in time. If the attacks had succeeded, they would have been the most deadly since Sept. 11 -- and would have had devastating ripple effects on the economy of the region. In part four of our series on terrorism in Southeast Asia, NPR's Michael Sullivan looks at the plot and how it was thwarted.

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 Andrea Seabrook reports Secretary of State Colin Powell goes before a key Senate committee today, as members of Congress take stock of the evidence he presented to the United Nations yesterday. Some Democrats say if the United States attacks Iraq, it must maintain a peace-keeping force there for years to come.