Shortly before landing, after she woke up, a flight attendant pulled her to the back of the plane to tell her about what had happened and to inform her that the man would be arrested at the airport in Paris.
Rather than allow her to sit elsewhere, the woman said she forced to return to their shared row and 'climb over' the man to return to the window seat until landing.
"What they didn't do was wake me up and move me to a safe place. What they didn't do was accommodate my request - after informing me of the assault - to sit anywhere else on the plane for landing."
"Instead, they made me climb back over the sex offender, trapped between him and the window for the rest of the flight. I was shaking and crying and trying not to get sick," she wrote.
After landing, the woman said she approached American Airlines staff at the Paris airport but was met with blank stares.
When she contacted the airline's head office, she said she received nothing more than an email which acknowledged the"disappointing service".
"I'll never know what exactly happened on that flight, but I do know I'll never feel completely safe flying again. Add an American Airlines airplane to the long list of places where, as a woman, I will feel anxious and vulnerable,"' she said.
"American Airlines, you knew what happened was criminal activity, - therefore you had the offender arrested - yet you did nothing to stop the man's actions or protect my safety in a horrifying situation. You chose to treat the man committing the crime with far more respect than the unconscious woman sitting beside him. As humans, we deserve more than that. So please, choose any other airline."
Eager for people to hear her story, she shared it on Facebook, writing alongside it: "Friends, please read. I was the victim of a sexual crime on a recent American Airlines flight. Please choose any other airline."
The airline did answer questions about what was done to stop the man's lewd behaviour while the flight was in progress.
It has not revealed where he was from, if he was arrested on the ground or where the flight took off from originally.
In statement, a spokesman said only: "American always strives to maintain a safe and comfortable travel experience for all of our customers. We are reviewing how we handled the situation on this flight, and have reached out directly to Ms King.
"During the flight, our crew requested that French law enforcement meet the aircraft in Paris. Upon arrival, French officials interviewed the male passenger regarding the allegations."
