|Tech firms call on U.S. to reform spying activities|
|American Airlines, US Airways to form largest air carrier Monday|
|Someone bought a $100,000 Tesla with Bitcoins|
|2 million Facebook, Gmail and Twitter passwords stolen in massive hack|
|Boost for trade as global deal struck|
Wal-Mart holds Exxon Mobil at bay and rules the Fortune 500 for the second year in a row. Which other companies made the top 50?