Hartman has been caught attempting to board various flights over the years and was jailed in 2015 for trying to bypass security at Chicago's two major airports.
However, this is not the first time that Hartman has been detained for trying to bypass airport security in the U.S. and claimed she may have boarded planes without a ticket eight times.
Marilyn Hartman, 66, managed to get through security at Chicago's O'Hare International Airport this week and board a flight to Heathrow.
At the court, assistant state attorney Maria McCarthy said Hartman, after entering the security checkpoint, went to a terminal and attempted to board a flight going to CT. She managed to evade the gate attendant by "blending in with the passengers", Chicago police told the Chicago Sun-Times.
Hartman has been charged with criminal trespass, a misdemeanor, and theft, a felony.
Hartman was flown back to Chicago Thursday night, where she was arrested upon her arrival.
Hartman reportedly said she "may have" boarded aircrafts without a ticket eight times, the report said.
Prosecutors at the time recommended that she be sent to a mental health program, but she walked out a week later.
The Transportation Security Administration has launched an investigation into how Hartman was able to slip by security, a spokesman said in a statement Friday, according to the Tribune.
Chicago Department of Aviation spokesperson said no passengers were endangered during the incident.
Marilyn Jean Hartman on Tuesday, Aug. 26, 2014.
"This matter is subject to an ongoing investigation and TSA is working closely with our law enforcement and airline partners in that effort", the statement said.
A judge ordered so-called "serial stowaway" held on $25,000 bond Saturday after she was arrested for taking yet another unauthorized flight. Her movements were caught on video.
In 2016 she was sentenced to six months in a mental health facility in IL for attempting to bypass security at two of the state's major airports.
According to CBS, Hartman has said that she likes being at airports because they make her feel safe. The judge dished out a harsh scolding as he recounted Hartman's history, which included several attempts to escape from mental-health facilities in IL.