Midday movers: Twitter, Textron, Sprint & more

Take a look at some of Friday's midday movers:

Delta Air Lines - The carrier's shares fell after an error on Delta's website resulted in heavily discounted fares.

General Motors - The car manufacturer's shares declined after news GM's China joint venture would recall nearly 1.5 million vehicles because of potential safety issues.

Textron - The parent company of Cessna Aircraft advanced after it agreed to acquire aircraft manufacturer Beechcraft for $1.4 billion in cash.

WPCS International - Shares of the company surged after it announced the launch of a bitcoin exchange.

Sprint - Shares of the wireless carrier jumped on speculation the company might be drawing closer to a merger with T-Mobile US.

Twitter - The social networking company fell after Macquarie Capital downgraded its stock to underperform from neutral.

ANI Pharmaceuticals - The drug maker's shares spiked after it bought the rights to 31 generic drugs already on the market from Teva Pharmaceutical Industries.

(Read More: See CNBC's Market Insider Blog)

—By CNBC's Kate Gibson.

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