"It was the most difficult transport experience I've ever had," Steklenski tells The Dodo. "To have a dog, a pup, so abused, so tortured, that you couldn't comfort him before the flight - it's the absolute worst feeling anyone in transport will know."
At last, Henley joined seven other dogs on that flight who would soon find their way to foster families.
But before Henley left the airport tarmac on his way to a new life, he paused - and looked back at Steklenski.
Almost as if to say thank you.
It's an image that, even weeks later, still haunts Steklenski.
"Henley hit me hard," Steklenski says. "I couldn't stop thinking about him. To be abused, scared and hours always from death, it just wasn't fair."
So earlier this month, the pilot paid his former passenger a visit at his foster home.