A mother wrote a heartfelt message to a mystery man who helped her and her baby daughter on a flight from Orlando to Philadelphia last week. Kelsey Zwick said she and her daughter, who was born prematurely and needs an oxygen machine, were on their way to Children's Hospital of Philadelphia (CHOP) when the stranger's random act of kindness warmed their hearts.

"To the man in 2D," Zwick wrote on Facebook, hoping the mystery man would see, "I don't know you, but I imagine you saw us somewhere. I was pushing a stroller, had a diaper bag on my arm and also lugging an oxygen machine for my daughter."

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"We pre-boarded the plane, got cozy in our window seat and made jokes to those around us about having to sit by my yelling-but-happy baby," Zwick wrote. "The flight attendant came over and told me you were waiting to switch seats," Zwick wrote in her message to the man. "You were giving up your comfortable, first class seat to us."

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