Three hours into the half-full flight to Paris, Laura Bushney, 26, said Mohd Rosli Bin Ab Karim sat beside her and allegedly began massaging her legs under the guise of "comforting her" and later put his hand down her pants.
She told Sunday Night, in an interview to air this week, she was terrified when the 54-year-old steward allegedly began touching her, but was "frozen in panic".
"I just keep saying why didn’t I scream, why didn’t I shout? Why didn’t I stop it? I am a strong person because I can do that, I know I can."
"When I was in the moment I couldn’t. I felt so scared, so petrified," Ms Bushney said.
However, Ms Bushney recorded the alleged incident on the mobile phone wrapped in a scarf next to her pillow.
Rosli, who is married with two children, has since made admissions to police.
In the recording she can be heard whispering what Rosli was doing to her.
"He's massaging my legs," she can be heard saying.
"I'm so scared, I just want to get off this plane."
After the passenger sitting in front of Ms Bushney, Canadian Sophie Lachance, 23, insisted Ms Bushney report what happened, the flight crew sat her down with the steward again.Canadian passenger Sophie Lachance
She also filmed this confrontation, in which Rosli can be seen pleading with her and saying his "intentions were good".
Ms Bushney made a formal complaint to police after touchdown at Paris Charles de Gaulle Airport, saying she had told crew at the beginning of the flight about her apprehension of flying with the airline in the wake of the two disasters, and Rosli had taken advantage of her vulnerability.
Malaysia Airlines has responded with a public statement but has not contacted Ms Bushney or offered any counseling or compensation.
"Malaysia Airlines can confirm that following allegations by a passenger travelling on flight MH20 from Kuala Lumpur to Paris on 4th August 2014 of inappropriate sexual behaviour by a member of the cabin crew, the member of staff in question has been detained for questioning by the French police."
"Malaysia Airlines expects and accepts nothing short of the highest standards of conduct from its crew and takes any such allegations very seriously."
Full story airs this Sunday at 8:45pm.