Delta Air Lines is saving $2 billion on fuel

Southwest (LUV), which will report earnings on Thursday, soared about 120% last year, making it the best stock in the S&P 500. Its shares rose on Tuesday morning as well.

So did the stocks of rivals United Continental (UAL), American (AAL), JetBlue (JBLU) and Alaska Air (ALK). Those four airlines will also report their latest results in the coming days.

Shares of smaller airlines Spirit (SAVE) and recent IPO Virgin America (VA) also gained altitude on Tuesday.

Factset: FactSet Research Systems Inc. 2015. All rights reserved.

Chicago Mercantile Association: Certain market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved.

CNN Money