A seven-month "60 Minutes" investigation into Allegiant Air, the Las Vegas-based ultra-low-cost carrier, found more than 100 serious incidents involving mechanical issues. The airline issued a brief statement to CBS News before the story aired, but in a response posted after the airing and in an internal memo, the airline alleged the segment was a "false narrative."

The internal memo was first tweeted by AirlineGeeks.com, and Allegiant later confirmed to CBS News that it had been sent to employees. "Know we are prepared to fight back against '60 Minutes,"' the memo reads.

Allegiant has provided an internal statement to employees regarding this evening’s #60Minutes segment: pic.twitter.com/f6HNm3VSRc — AirlineGeeks.com (@AirlineGeeks) April 16, 2018

To see a response from the airline's vice president of operations, go to the bottom of this story.

"60 Minutes" correspondent Steve Kroft said in an "Overtime" segment that "60 Minutes" got "no cooperation" from either Allegiant or the FAA in the beginning stages of reporting the story.

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In the memo, Allegiant blamed the report on a "terminated employee" who is "currently engaged in a lawsuit seeking money damages against the company."

It's unclear which employee Allegiant is referring to. The "60 Minutes" piece details an incident involving Captain Jason Kinzer, who was fired in 2015 six weeks after turning around shortly after takeoff due to smoke in the cabin. Loretta Alkalay, who spent 30 years as an FAA lawyer, said she has "never ever heard of an airline firing a pilot for an emergency evacuation."

But Kinzer's story is just one of the incidents detailed in the report. "60 Minutes" quoted air safety experts and passengers, and public documents show an alarming number of aborted takeoffs, cases of cabin pressure loss, emergency descents and unscheduled landings.

On its social media feed, Allegiant answered those who tweeted they were worried by asking them to send a private message. In response to one comment, Allegiant wrote "we'd like to share our concerns about the story with you." It's unclear what Allegiant means by "concerns."

@Luevan Thank you for reaching out. We understand your concern, but we’d like to share our concerns about the story with you. If you’d like, please DM us so we can share some information. https://t.co/7crmFHe6Fu — Allegiant (@Allegiant) April 16, 2018

Allegiant posted a new statement after the segment aired, taking a similar tone to the memo. "Incidents referenced are years old, and took place before our most recent, comprehensive FAA audit. The story breaks no news," the statement read.

The "60 Minutes" story is not about old incidents: Between Jan. 1, 2016 and the end of Oct. 2017, "60 Minutes" found more than 100 serious mechanical incidents, including mid-air engine failures, smoke and fumes in the cabin, rapid descents, flight control malfunctions, hydraulic leaks and aborted takeoffs.

The story highlights how Allegiant's problems come from the confluence of its aggressive business model and a safety culture aviation experts find to be lagging.

John Goglia, who has more than 40 years of experience in the aviation industry, including nine as a presidential appointee to the National Transportation Safety Board (NTSB), told "60 Minutes" he has "encouraged my family, my friends and myself not to fly on Allegiant."

Users on social media were shocked by the report. Kroft himself said in the "Overtime" segment that he is "flabbergasted" more people don't know about Allegiant's safety record.

@Allegiant Thank God for 60 Minutes, was about to book passage to FtLaudale this summer on your airline but no more, ever, ever- — Karpus & Trotsky (@LavishPolack) April 15, 2018

It really stinks that those of us in rural markets with few travel options can now never fly Allegiant ever again. But thank God that #60minutes is literally saving our lives. — Rebecca F. Miller (@FlatheadMama) April 15, 2018

Welp, won’t be flying #Allegiant air. Thanks for the heads up #60minutes 👍🏼 — CheekyChopsNJ ™🇬🇧 (@BitCheekyNJ) April 15, 2018

“Please start breathing through your shirts.” Welp, not flying @allegiant anymore. #60Minutes — Chris Clonts (@CClonts) April 16, 2018

The airline issued a statement from Allegiant Vice President of Operations Eric Gunst stating: