Discount airline JetBlue Airways Corporation (NASDAQ:JBLU) is 17% higher premarket, after activist investor Carl Icahn disclosed a 9.91% stake in the company. Icahn called JetBlue Airways an undervalued and "attractive" stock to invest in, also disclosing discussions with the company's leadership about representation on the board. Should this positive premarket action keep up, JetBlue Airways stock will open at its highest level since a late-August bear gap of 8.1%. The shares would also be clearing their 2 ...