Mortgage applications last week edged down although mortgage rates remained near record lows, signaling the housing market was still far from recovery.
The expo is one of the year's largest annual display of new military equipment.
Groups known as "Super PACs" raised more than $42 million to back Republican US presidential contenders in 2011.
Michelle Obama cajoled TV talk show host Jay Leno into nibbling on fruits and vegetables on the Tonight Show.
Facebook filed to raise a targeted $5 billion in a hotly anticipated initial public offering, setting the stage for Silicon Valley's biggest-ever IPO.
American Airlines wants to eliminate 13,000 jobs as it seeks to cut labor costs by 20 percent.
It aimes to give every responsible homeowner the chance to save about $3,000 a year on their mortgage by refinancing at low rates.
Mitt Romney had a large lead in the Florida Republican US presidential primary on Tuesday, with nearly one third of the votes counted, television networks reported.
Mitt Romney was poised to retake the lead in the Republican White House race as Florida polls opened on Tuesday.
Obama downplayed a recent report about the use of US drones in Iraq, indicating that the unmanned aircraft are mainly used for embassy surveillance.
Apple Inc has named the chief executive officer of the largest UK consumer-electronics retailer as the head of its retail operations.
The US CBO predicted that the federal government would run a budget deficit of around $1.1 trillion in the 2012 fiscal year