Official Allegiant website, the only place to book Allegiant s low fares for flights to Las Vegas, Florida, and more. Buy your airline tickets direct and save.. Allegiant Air is a small, ultra low cost carrier based in Las Vegas, that happens to be one of the country s most profitable airlines. But, according to federal aviation records and interviews with pilots, mechanics and industry experts, it may also be the most dangerous. The airline flew million p.engers .Happy Monday, travelers! Check out this week s Q A to discover how you can save the most money when bo.ng your favorite Allegiant trip! Have another travel question? Let us know. We pick one question each week, track down the experts and provide you with the answers every Monday. AskAllegiant GetAway .