Little did he know that his handwritten thank you note would become a viral Internet sensation.

Why? The woman to whom he wrote the note was Australian actress Claire Holt, who took a picture of the note and tweeted it to her more than 700,000 Twitter followers.

The tweet read: "Wow. Received this note from Captain Kendall on my flight today. Truly thoughtful. Treat him well @DeltaAssist!"

According to Yahoo, Holt is best known for her television work in "The Originals", "The Vampire Diaries" and "Pretty Little Liars."

Delta Air Lines confirmed to ABC that Kendall, a 25-year Delta pilot, wrote the note.

According to the ABC story, Kendall did not know Holt was a celebrity, only that she was a serious frequent flier.

Diamond status is the highest level of frequent flier membership in Delta's SkyMiles program. It requires 125,000 miles flown per year.

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In this file photo from October 2024, Atlanta Braves outfielder Jorge Soler and teammates react after losing to the San Diego Padres 5-4 in San Diego. The Braves and Soler, who now plays for the Los Angeles Angels, face a lawsuit by a fan injured at a 2021 World Series game at Truist Park in Atlanta. (Jason Getz/AJC)

Credit: Jason.Getz@ajc.com