Analyst downgrades: Airline stocks, SI and INAP

MOST NOTEWORTHY: The airline sector, Siemens and Internap were today's noteworthy downgrades:

Lehman downgraded the airline sector to Neutral from Positive, citing higher fuel costs and the weakening economy. AirTran (NYSE: AAI) and U.S. Airways (NYSE: LCC) were downgraded to Equal Weight from Overweight. UBS said it can no longer recommend airline stocks due to weakening economy, high fuel prices, and less likely industry consolidation. The firm downgraded Continental Airlines (NYSE: CAL), Delta Air Lines (NYSE: DAL), Northwest Airlines (NYSE: NWA) and U.S. Airways to Neutral from Buy.
Goldman removed shares of Siemens (NYSE: SI) from their Conviction Buy List as they believe the company may book additional charges of $1.2B this year.
Jefferies cut Internap (NASDAQ: INAP) to Underperform from Buy as they believe the 10-K filing delay and revenue quality questions reduce visibility into the health of the business.

OTHER DOWNGRADES:

Wachovia lowered Amgen (NASDAQ: AMGN) to Market Perform from Outperform.
SI International (NASDAQ: SINT) was downgraded to Neutral from Outperform at Cowen.
Citigroup cut Assured Guaranty (NYSE: AGO) to Hold from Buy.

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