According to Phoenix authorities, 61-year-old Yukari Miyamae started arguing with the TSA agent, refusing to be screened at Phoenix's international airport.
TSA said Miyamae was not even receiving a pat-down at the time of the incident.
During the argument, Miyamae apparently squeezed and twisted the agent's left breast with both hands.
Fellow travelers said she went too far.
Police were called and say Miyamae admitted grabbing the TSA agent and continued to argue with officers before she was arrested.
She now faces sexual abuse charges. If convicted, Miyamae will have to register as a sex offender.