A November 2016 analysis by the Tampa Bay Times noted that Allegiant's planes were four times more likely to have in-flight failures than other major US airlines. A 60 Minutes report by CBS News in 2018 continued to investigate the issues first raised by the Tampa Bay Times. Public records cited in the investigation found that the airline had more than 100 serious mechanical incidents between January 1, 2016 and October 31, 2017, including "mid-air engine failures, smoke and fumes in the cabin, rapid descents, flight control malfunctions, hydraulic leaks and aborted takeoffs." Other public records further revealed that Allegiant aircraft, on average, were nearly three and a half times more likely to have mid-air breakdowns than American, United, Delta, JetBlue and Spirit.
In December 2015, the FAA issued a letter of correction due to an incident where an Allegiant aircraft attempted to fly to Hector International Airport in Fargo, ND in late July 2015, which was at the time within a temporary flight restriction due to a rehearsal by the Blue Angels flight team for an upcoming air show in Fargo respectively. The pilots flying the aircraft then declared a fuel emergency stating, "Yeah, listen, we're bingo (empty) fuel here in about probably three to four minutes and I got to come in and land." The pilots were scolded by the airport's tower who said, "Your company … should have been aware of this for a number of months," regarding the airspace restrictions which would have prevented flight to the airport. The pilots flying the aircraft were, at the time, the airline's vice president of flight operations and its director of flight safety.
In May 2017, Allegiant Air took delivery of its first brand-new A320. Allegiant took delivery of ten new A320s in 2017 and is scheduled to accept two in 2018. All new aircraft will be painted in Allegiant's new livery at the time it is delivered. Older Airbus aircraft will be repainted during their C-checks. The new Airbus aircraft will have fuel-efficient sharklets. The new A320s seat 186 passengers, an increase of the 177 seats that are found in the rest of the Allegiant A320 fleet. To fit the additional nine seats, Allegiant opted for the Airbus Space-Flex V2 Lavatory. 
On October 25, 2007, the airline opened a fourth focus city and operations base at Phoenix-Mesa Gateway Airport in Mesa, Arizona, connecting 13 cities already served by Allegiant and one new city to the Phoenix metropolitan area. The airport announced a 10,000-square-foot (930 m2) expansion in August 2008, which increased the number of gates from two to four and allowed Allegiant to triple the number of flights from Phoenix. The expansion was funded by a loan from Allegiant which will be repaid by passenger fees.
On June 22, 2009, Frontier Airlines announced that pending bankruptcy court approval, Republic Airways Holdings, the Indianapolis-based parent company of Republic Airlines, would acquire all assets of Frontier Airlines for the amount of $108 million. Thus, Frontier Airlines would become a wholly owned subsidiary of Republic. However, 5 weeks later on July 30, Dallas-based Southwest Airlines announced that it would be making a competing bid of $113.6 million for Frontier with intentions to also operate Frontier as a wholly owned subsidiary, but that it would gradually fold Frontier resources into current Southwest operating assets.
As Republic Airways Holdings was in the process of bidding to acquire Frontier in 2009, it was also in the process of acquiring Milwaukee-based Midwest Airlines. Through the fall and winter of 2009, Republic operated its two new acquisitions as separate brands. However, to improve efficiency by better matching aircraft capacity to route demand, Republic began to intermix the fleets of the two airlines, swapping a portion of its higher-capacity planes from Frontier with its smaller-capacity planes from Midwest and vice versa. However, the move caused some confusion amongst the public, as the two brands did not offer the same amenities and did not match the amenities mentioned on the airfare. As a result, in the Spring of 2010, Frontier and Midwest Airlines announced that their brands would merge, with Frontier being the surviving brand. This was a merger of brands only—no Midwest Airlines aircraft was ever operated by Frontier, as by this time, all Midwest Airlines flights were operated on its behalf by other Republic Airways Holdings subsidiaries.
On July 24, 2007, jetBlue reported that its second-quarter revenue increased to $730 million, compared to $612 in 2006. Second quarter net income grew to $21 million for the quarter, from $14 million the previous year. CEO David Barger said the airline will take delivery of three fewer planes this year and will sell three planes from their current fleet, "slowing capacity growth ... to strengthen our balance sheet and facilitate earnings growth", but will continue to add two to four new destinations each year.
Although it does not fly to Canada, Allegiant advertises extensively there and flies from about a dozen small airports near the Canada–US border. Many of its customers at airports such as Bellingham, Washington (BLI), Niagara Falls, New York (IAG), Ogdensburg, New York (OGS), Grand Forks, North Dakota (GFK) and Plattsburgh, New York (PBG) are Canadians, who can save money by flying from U.S. airports.
So I call travelocity, and long story short, they end up telling me that the Freemount hotel has no available rooms for those nights. Completely shocked, I explain that the $630 has already been debited from my account. To which they explain "don't worry were going to refund that money"I ask "when?"... and they tell me IN A WEEK. I explain that I'M ALREADY IN VEGAS AND NEED A HOTEL. To which they say that they will find me another hotel nearby with the same availability.
In July 2007, the airline partnered with 20th Century Fox's film The Simpsons Movie to become the "Official Airline of Springfield". In addition a contest was held in which the grand prize would be a trip on JetBlue to Los Angeles to attend the premiere of the film. The airline's website was also redecorated with characters and their favorite jetBlue destinations and the company was taken over by the show/film's businessman villain Montgomery Burns.
After booking a excursion in St Maarten that never happened as the companies website and phone number were taken down so no final arrangements could be made. Called travelocity twice and still can not seem to get it through their heads about the service not happening. They tried contacting the company....no luck then they asked me for the contact information I had.....are you kidding me it is your contracted service (IDIOTS)....anyway none of my contact info worked for the company why badger me.....just give me my refund. I will post followups as they happen
Allegiant also transports firefighters for the United States Forest Service as well as college basketball teams. Allegiant had a contract to supply charter flights from Miami to four cities in Cuba beginning June 2009. One aircraft was committed to the contract. The contract was for fixed-fee flying, meaning all the airline was required to do was provide the dry aircraft and the flight crew. The contractor was responsible for all other costs including fuel. However, Allegiant ended this service in August 2009.