"It's the Batplane," a man says.
"It's the Batmobile!" a woman replies, before adding "Hey Batman!"
On another video, a woman can be heard saying that she had spotted the bat five minutes earlier. "I thought I was, like, hallucinating," she said.
One man didn't have to wonder if what he saw was real: he said he literally got hit in the head. In a response, Spirit asked for his reservation information so it could investigate, assuring him: "We want to raise your Spirit-s!"
It wasn't clear how long the flying mammal was free to roam about the cabin, but Scattini said someone finally found a way to contain it.
"Eventually someone trapped it between a book & a cup and then locked it in one of the restrooms for the remainder of the trip," he wrote.
On its social media account, the airline replied to Scattini on Thursday: "We certainly want to address this for you." Public relations representatives for the airline did not respond to a phone call or emails Friday afternoon. On Twitter, Scattini wrote that the carrier offered reimbursement for the flight and a $50 voucher.