Among the stock activity stories for Tuesday, June 12, from AP Business News:
— Shares of Spirit Airlines Inc. rose after a Citigroup analyst said a recent decline in the airline's stock created an opportunity for investors.
— Navistar International Corp.'s stock fell as a pair of analysts said that there may be some hurdles in the way of Volkswagen or Fiat potentially buying a stake in the heavy trucks and engine maker.
— Shares of navigation software-maker TeleNav Inc. plunged a day after Apple said its new mobile operating system includes turn-by-turn navigation, a change that could mean iPhone users stop paying for TeleNav's service.
