Take a look at some of Tuesday's midday movers:
American Airlines fell after the carrier lowered its first-quarter guidance, blaming cancellations due to bad weather.
Allegiant gained ground after Deutsche Bank upgraded the travel company to buy from hold and set a $130 price target, citing better sales trends and cost controls.
Comcast and Time Warner Cable both lost ground. Comcast, which is the parent of CNBC, told U.S. regulators the merger of the two would not deprive consumers and would help them compete against newcomers like Apple and Google in the video market.
Gigamon plummeted after the technology company cut its revenue outlook because a large international order fell through.
Alkermes rose after its experimental drug to treat schizophrenia did well in a late-stage study.
—By CNBC's Rich Fisherman.
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