If you're having one of those days where you just give up hope on humanity altogether, we promise this post will change your mind.
It's the story of a mother, her sick child, and a good Samaritan's small gesture that meant the world to them.
It began last week, when Kelsey Zwick boarded a flight from Orlando to Philadelphia, with her 11-month old daughter Lucy in tow.
An anonymous man in first class must have noticed them - and Lucy's oxygen tank - because he offered to give up his first class seat for them.
In a heartfelt Facebook post about the act, Zwick revealed that Lucy was born premature, and that they were flying to "see her "˜friends' at CHOP (Children's Hospital of Philadelphia)."
"I cried my way up the aisle while my daughter Lucy laughed!" she wrote. "She felt it in her bones too... real, pure, goodness. I smiled and thanked you as we switched but didn't get to thank you properly."
She went on to thank the man for more than just giving up his seat, but for "seeing us and realizing that maybe things are not always easy."
"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 can't wait to tell Lucy someday."
She signed off of the post with thanks for "AA 588 passenger in seat 2D," and tagged her message with, "If you find him, tell him thanks."
And, of course, once the internet fell in love with Zwick's story, they searched far and wide for the man in 2D, finally identifying the kind stranger as Jason Kunselman.
"She came up [in line to board] and had the normal roller board luggage and also which I found out later, was an oxygen concentrator," Kunselman remembered in an interview with Good Morning America.
"I went up and asked the flight attendant if she thought she would be more comfortable sitting up in my seat and I would take the one in the back."
Kunselman also told the Mail Online that he was "tearing up" just looking at the little girl in her oxygen mask. Since he travels often, he explained, giving up his first class seat was no big deal.
Like Zwick described, Kunselman said he immediately saw a woman "walking up crying" as he left for her seat in the economy section.
"It just seemed like the right thing to do," he said.
While he acted out of the goodness of his heart, American Airlines plans to reward Kunselman for his kindness.
"In the words of Kelsey," they said in a statement, "we also want to pay it forward with our thanks and appreciation."
While the simple story of Kunselman's good deed has a happy ending, many readers wondered if Zwick's daughter will be alright.
Lucy is still being treated for a chronic lung condition related to complications from Zwick's pregnancy.
But Zwick says she's doing well, and enjoys life with her parents and twin sister Eva when she's not in hospital.
"The first time we went [to CHOP] in September, she was still [on] 100 percent on oxygen; all day, all night," she told Yahoo.
"They checked her out, and within two weeks after seeing them, she came off a couple hours a day. Three months after seeing them, she's off during the day completely. She's on at night or if she flies, because of the pressure."