Burt noted in her letter to the airline that she was traveling with her husband and three small dogs - including Darcy - and had done so for 12 years without any previous problems. They pulled her out of the carrier and noticed that she was panting, panicking, and her tongue was turning blue, a sign of not getting enough oxygen.
But Burt told the attendant the dog was struggling, and that's when attendants Renaud Fenster and Diane Asher came to help, she told the airline.
Once the oxygen mask was applied, the dog recovered quickly.
They brought Darcy water and ice but, as we found out from an interview Spencer on United States broadcaster ABC, the poor pooch needed more help. When Burt opened the flap to give the pup some air, she realized Darcy's tongue was blue.
These flight attendants are being hailed for looking after their passengers - no matter their species - during their time of need.
"I thought perhaps she was warm and loosened the zipper on her carry-on so she could poke her face out", Mrs Burt wrote.
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Darcy was in her carrier under a seat when Burt noticed that the dog was pushing her head against the mesh opening.
Photos of Darcy with the oxygen mask over her mouth have spread across social media.
"Renaud and Diane saved a life, some may reduce the value of the life because Darcy is a canine, I do not".
"I decided that we needed to consider using oxygen to support the animal".
JetBlue responded with this statement: "We all want to make sure everyone has a safe and comfortable flight, 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".
Michelle later wrote a thank you note to JetBlue in which she praised the actions of their flight crew.