Darcy, a three-year-old French bulldog, was travelling in a crate on a flight from Orlando to MA when it began to have trouble breathing.
Burt, who was traveling to Worcester from Florida with her husband Steven, said Darcy was suffering from hypoxia, or a deficiency of oxygen. Without warning the dog's tongue and gums turned blue and she began panting frantically.
When holding her and giving her water didn't help, two flight attendants provided an oxygen mask for Darcy to help her breathe, which may have saved her life. When that failed, one crew member who also owned a French bulldog brought an oxygen tank and mask and said "maybe this will help".
She held Darcy in her lap, trying to calm her.More news: British regulator to fine Facebook over data protection breaches
"I thought perhaps she was warm and loosened the zipper on her carry-on so she could poke her face out", Mrs Burt wrote. "I believe [crew members Renaud Spencer and Diane Asher] saved a life", said Burt.
It was certainly a much happier outcome than an incident involving another French bulldog, a puppy, that died in March in a United passenger cabin after a flight attendant mistakenly told its owner to place the carrier in an overhead bin.
In a letter to the airline posted on the Everyday Jumpseater Facebook page, Michelle explains that Darcy was pushing her head against the mesh part of the carrier and not lying down, despite Steven instructing her to.
"I decided that we needed to consider using oxygen to support the animal".More news: Princess Charlotte Tells Press 'You're Not Coming' At Christening
Darcy, normally a very obedient dog, wasn't responding to commands to lie down during the flight, which is when Burt chose to check on her.
JetBlue said in a statement to ABC News its crew "want to make sure everyone has a safe and comfortable fight, including those with four legs". "We're thankful for our crew's quick thinking and glad everyone involved was breathing easier when the plane landed in Worcester".More news: Centre-backs Raphael Varane, Samuel Umtiti star as France reach the final