"We have reason to believe this story was instigated by a terminated employee", Allegiant wrote in a letter to employees.
Robert Kane, left, and Sean Jenks of Port City Air refuel an Allegiant Air passenger jet during a turnaround at Portsmouth International Airport at Pease in 2016.
The airline had issued a brief statement to the media before the story aired.
CBS' 60 Minutes reported on an alleged string of unsafe issues aboard Allegiant Airlines flights such as aborted takeoffs, cabin pressure loss, emergency descents and unscheduled landings aboard aging aircraft in recent years.
One passenger said she hadn't heard about the "60 Minutes" report but wasn't surprised once she was told about it.
Allegiant also posted a statement dismissing the incidents described in the show as "years old" and as having occurred before the company's latest FAA audit. Despite that, much of the flying public seems to be unaware of the airline's record, correspondent Steve Kroft said. We've never wavered on the pact and after the 60 Minutes piece, we're glad we haven't.
"60 Minutes" alleged Allegiant's planes are more likely to have mechanical problems in-flight versus its competitors, citing industry experts and a review of FAA records. "They must adhere to FAA rules and regulations and it appears they continue to do that". To suggest that Allegiant would engage in the practice of asking team members to violate company and regulatory obligations is offensive and defamatory.More news: Sterling K. Brown and Bryan Tyree Henry in 'Hotel Artemis' trailer
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Allegiant's stock has taken a blow since the segment aired on Sunday.
The pilot involved in that incident is suing the airline for wrongful termination.
The FAA has been fairly passive toward correcting Allegiant's difficulties, "60 Minutes" said.
According to Zacks, "We expect Allegiant's first-quarter results to be hurt by high labor and fuel costs". They received the corresponding documents from each of the airlines except Allegiant, which objected. "The FAA also provides an anonymous channel for any aviation employees to voice their concerns".
Allegiant Air runs non-stop flights to four southeastern USA destinations from HIA, including Orlando, St. Petersburg and Punta Gorda, Fla.; and, on a seasonal basis, Myrtle Beach, S.C.
Allegiant's workforce is made up of more than 4,000 dedicated and hard-working people who wake up every day thinking about how to move our customers safely from one place to another.
There was Teamsters 1224 Union leader Capt. Daniel Wells, who represents Allegiant's pilots among those of other airlines, saying: "What I hear from hundreds of conversations with Allegiant pilots, is the management of Allegiant seems to denigrate the pursuit of safety". "We have safely carried almost 90 million passengers since beginning operations in 2001".