US STOCKS-Intel, transports sap Wall Street's strength
* Dow snaps nine-day winning streak
* Southwest, Union Pacific drag down transports
* Qualcomm, Biogen surge after results
* Indexes fall: Dow 0.42 pct, S&P 0.36 Pct, Nasdaq 0.31 pct (Updates with close of U.S. market)
By Lewis Krauskopf
July 21 (Reuters) - Wall Street cooled off on Thursday as disappointing quarterly reports from tech stalwart Intel and from transportation companies stalled momentum in a U.S. corporate earnings season that has been better than feared.
The S&P 500 and Dow industrials pulled back from record highs and the Dow snapped a nine-session streak of gains.
Southwest Airlines fell 11.2 percent and led other airline stocks lower after the company forecast a drop in a key profitability metric. Union Pacific dropped 3.4 percent after the No. 1 U.S. railroad posted a lower quarterly net profit, hurt by slumping freight volumes.
The stocks dragged down the Dow Jones transport index , which is often seen as a barometer of the market's health and the overall economy. Continuación...