Dali was challenged by flight attendants mid-flight when it was revealed she did not have a boarding pass, and detained on arrival in Paris.
Delta said the incident was a “deviation from standard procedures,” with reports claiming Dali had moved between aircraft lavatories so crew members would not realise she did not have an assigned seat.
Dali was flown back to the United States on Wednesday after two failed attempts to return her, with the woman thwarting the first attempt Saturday by screaming, while the airline refused to transport her Tuesday.
“Dali admitted to flying as a stowaway... She also stated that she knew her conduct was illegal,” said the FBI complaint.
A federal judge issued a temporary order of detention until Friday afternoon to give Dali time to come up with bail and a verifiable residence, prosecutors said.
Dali did not enter a plea, they added.
-Agence France-Presse