Life can be busy at times and it is great to show compassion towards those struggling to make it through the day.

A stranger donated his first-class American Airlines ticket to comfort an economy class passenger’s sick baby.

Kelsey Rae Zwick was making the 2.5 hour journey from Orlando to Philadelphia with her 11-month-old daughter Lucy, when the flight attendant informed her another customer wanted to swap seats. Much to her delight the new seat was in the first-class section.

The mother was so pleased she burst into tears.

“I am just standing there looking at him, crying just saying, ‘thank you,'” she said according to Parenting is Easy. “He just quietly was smiling so big and was like, ‘you are welcome.'”

After disembarking from the flight Zwick tried to find the nice stranger at the gate but she was unable to find him. Despite her best effort, the two missed each other.

She still wrote an open letter to the kind stranger and praised him for his compassion. She also encouraged others to share their touching stories.

“To the man in 2D, Today you were traveling from Orlando to Philly. I do not 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. We had smiles on our faces as we were headed to see her ‘friends’ at [the] Children’s Hospital of Philadelphia. 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. The flight attendant came over and told me you were waiting to switch seats. You were giving up your comfortable, first class seat to us. Not able to hold back tears, I cried my way up the aisle while my daughter Lucy laughed! She felt it in her bones too … real, pure, goodness. I smiled and thanked you as we switched but did not get to thank you properly.”

BL understands there are many challenges in life, and it would have been easy for the passenger to do nothing. However, he gave up his first-class seat to help make the world a better place.

She continued:

“Thank you, not just for the seat itself but for noticing–for seeing us and realizing that maybe things are not always easy [and] for deciding you wanted to show a random act of kindness to us. It reminded me how much good there is in this world. I cannot wait to tell Lucy someday. In the meantime … we will pay it forward.”

Shortly after Zwick shared the letter it went viral across the internet. The message has been shared more than 586,000 times on Facebook and even received widespread media coverage.

The airline finally linked Zwick with her unknown fellow passenger, Jason Kunselman. The man then presented his side of the story.

“She said thank you and said, ‘I know I did not get to thank you in a proper way’ … and that we need more kindness like I showed to her in the world,” he said according to the publication.

BL understands this small act of generosity had a huge impact on Zwick and Lucy. It shows how one unselfish act can make a stranger’s day.