Facing a steep drop to the tarmac, she leaned out of the aircraft and called over a ground crew, who got her out.
He is asking how the heck they left me on the plane.
"I wake up around midnight, few hours after [the] flight landed, freezing cold still strapped in my seat in complete darkness", Adams said in the post.
The entire plane was empty, O'Brien wrote in a Facebook post shared last week by her friend on her behalf.
"I just woke up alone in plane", O'Brien texted Noel-Dale at 11:45 p.m., according to messages published by CTV News.
She attempted to call a friend to tell them what was happening, but her phone died and she was unable to charge it because the plane's power was off.
At present, the airline is trying to find out how Adams was forgotten on the flight and none of the crew members noticed that she had not left her seat.
Since Adam has made these claims, Air Canada has stated that they would look into the issue, but have not confirmed whether or not this incident actually occurred.
Aimer said a cleaning, catering or flight crew would have discovered Adams in the morning had she not been so proactive, but it's possible someone with malicious intent could hide on a plane in this manner. She eventually found a flashlight that helped her figure out how to open an exit door.
She added: "I search frantically for a rope so I can climb down to safely (flight attendants seat is right by door I opened) but the seatbelt is too short to hang from so back to my distress signals".
She was then met by an Air Canada representative, who apologized and offered her a ride and hotel accommodation but Adams says all she wanted to do was go home.
Toronto Pearson International Airport did not respond to a request for comment late Sunday.
The posting by Adams' friend soon amassed more than 100 commenters, many of whom expressed shock that the airline could miss a person sleeping on the plane.
After pilots landed the flight at its diverted location at Will Rogers World Airport in Oklahoma City, officers boarded the plane to take Ganus into custody.
O'Brien wrote that she continues to be affected by her experience and now struggles to sleep, often "waking up anxious and afraid" that she is alone and trapped "some place dark". Had she known that it would mean she would find herself locked in the empty aircraft, she probably would not have shut an eyelid.