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The new Southwest Airlines livery is called "Heart." Southwest Airlines

Southwest Airlines Co. (NYSE:LUV) , the 47-year-old discount carrier based in Dallas, unveiled a new look for its planes at a press event on Monday. Called "Heart," the new livery is the brand's first new one since 2001.

The airline also shared the new look and name on Twitter:

"Our collective heartbeat is stronger and healthier than ever, and that's because of the warmth, the compassion, and the smiles of our People," Gary Kelly, Southwest's chairman, president and chief executive, said. "The Heart emblazoned on our aircraft, and within our new look, symbolizes our commitment that we'll remain true to our core values as we set our sights on the future."

The new design comes as Southwest is going through some big changes: the airline added international destinations to its roster this year and will soon complete a merger with AirTran.