The outburst on the flight - just a week after London authorities said they foiled a terror plot to blow up trans-Atlantic flights - prompted a massive security scare.
Gov. Mitt Romney said the woman was claustrophobic and became so upset she had to be restrained, and passengers said Mayo appeared to have emotional problems.
"She was in a frenzy," passenger Martin Drinkwater of London told The Boston Globe. "She then pulled her trousers and knickers down and squatted on the floor."
Antony Nash, 31, of San Diego, said he grew nervous watching the muttering woman seated near him, as she paced and made too many trips to the bathroom. The pilot did not make a general announcement to passengers of what was happening.
"I noticed F-15s next to the plane. I said, 'Oh my God.' And then we saw the emergency vehicles," Nash said.
Terror scares garner particular attention in Boston because of Logan's history. Members of al-Qaida hijacked two planes from Logan on Sept. 11, 2001, and flew them into the World Trade Center towers in New York.
Logan airport also was where an American Airlines Paris-Miami flight was diverted in 2001 when Richard Reid, the so-called shoe bomber, tried to blow up the plane. He was thwarted by attendants and passengers after he tried to light a fuse leading to the concealed plastic explosives in his sneakers. He is now serving a life prison sentence.
Mayo waived her right to a probable cause hearing on a charge of interfering with a flight crew.
New information underlines how close the plotters were to mounting attacks.