The federal tax cut is giving corporations a little extra cash to work with, and Bank of America Merrill Lynch said airlines could take advantage of their clients’ expanded spending power. The Rating BofA Merrill Lynch analysts Andrew Didora and Emma Young upgraded American Airlines Group Inc AAL 3.63% from Underperform to Buy and Spirit Airlines Incorporated SAVE 1.45%and Allegiant Travel Company ALGT 1.44% from Neutral to Buy. BofA maintained Buy ratings on Delta Air Lines, Inc. DAL 2.24% and United Continental Holdings Inc UAL 2.55%. Southwest Airlines Co LUV 0.8% and Alaska Air Group, Inc. ALK 1.72% caught downgrades from Buy to Neutral and JetBlue Airways Corporation JBLU 2.64% from Buy to Underperform. SourceStochastics are entering overbought territory, so the upside is over. The price will go down to the lower edge of the rising channel. $AAL, American Airlines Group, Inc. / D Same here. $SAVE, Spirit Airlines, Inc. / D And pretty much the same situation here. $ALGT, Allegiant Travel Company / D