A senior citizen who suffers from claustrophobia offered a man in the aisle seat on a recent Delta Airlines flight $100 to switch with her.

Though he repeatedly declined, and offered his seat happily, the woman would not let it lie, eventually telling him to give some of the money to his kids as a lesson that being kind brings rewards.

The man, who was not named, shared his story in a recent Reddit room for airline encounters.

“As I approached my seat an elderly lady was having a hard time getting her bag in the overhead so I offered to help. She ended up being in 1D and I was 1C,” the passenger wrote on the sub-Reddit thread r/delta.

“She immediately said she’d pay me $100 to swap seats because she feels claustrophobic in the window seats in this particular seat configuration. Even though I prefer an aisle I told her that I’d gladly switch for free…”

As boarding continued, the man, an engineer by trade, conversed freely with the woman, eventually leading him to believe that the question of payment had been settled: he was not going to willfully take money for a courtesy he hoped anyone would do for free.

Eventually, they landed in Atlanta, and the woman slipped $100 out of her purse and again offered it to the man.

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“I tried to refuse again, but she told me to take it and give it to my kids but to explain to them how being nice to others can lead to something nice in return,” he recounted on the social media site.

He concluded his post by questioning the wisdom of offering his kids money, as he foresaw a world in which they’d perform many good deeds but always with a request for a reward.

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One of the commentors said they had recently been in the woman’s position, and wished there was some easy way to reward the seat-swapper in their story. As it turned out, the commenter alerted the flight attendant, who was able to add points to the passenger’s frequent flyer account.

What flies there around flies back around.