However, when Aldecosea arrived at the airport on 29 November a year ago, Spirit staff informed her that rodents were not allowed on board the airline's flights.
The airline concedes that an employee told Aldecosea over the phone that the hamster would be allowed on the flight, but says that the employee was mistaken and their policy does not allow rodents.
A Florida woman has reportedly filed a formal complaint with Spirit Airlines, after she claimed the staff forced her to flush her pet hamster down the toilet.
She has a lawyer and is considering suing the airline "over the conflicting instructions that wound up pressuring her into making an anguished decision".
Ms Aldocosea said Pebbles was "scared" and described putting the hamster down the toilet as "horrifying".
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Aldecosea said her doctor certified her hamster as an emotional support animal and she had the certificate with her to prove the authenticity of it.
A USA airline has hit back at a passenger who claimed she had no choice but to kill her pet hamster after it was refused entry to the plane. In January, an emotional support peacock named Dexter was barred from travelling on a United Airlines flight, despite having been bought its own ticket. Which is true, so don't flush her down a toilet MY GOSH.
But once at the airport, Pebbles was denied entry onto the flight. "I sat there for a good 10 minutes crying in the stall". After agonising over the decision for a while (and considering hiring a vehicle to drive to Florida) she did the unthinkable: she flushed Pebbles.
She was a student at Wilson College in Pennsylvania at the time and is now a student in Texas, he said.
"I didn't have any other options", she said, the Herald reported. Nevertheless, when she attempted to check in, Spirit insisted that Pebbles could not board with her.
Aldecosa's attorney told the Miami Herald the hamster could fit in the palm of the pet owner's hand.
"Hamsters are welcome in our checkpoint", the agency said in a statement. While many airlines allow dogs and cats, major airlines like United, Delta, and American do not allow rodents for safety and health reasons.
The US Transportation Safety Administration (TSA) does not prohibit carry-on hamsters.