NEW YORK--(BUSINESS WIRE)--Halper Sadeh LLC, an investor rights law firm, is investigating whether the merger of Allegiant Travel Company (NASDAQ: ALGT) and Sun Country Airlines is fair to Allegiant shareholders. Upon completion of the proposed transaction, Allegiant shareholders will own approximately 67% of the combined company. Halper Sadeh encourages Allegiant shareholders to click here to learn more about their legal rights and options or contact Daniel Sadeh or Zachary Halper at (212) 763-0060 or sad ...