Various police reports say the woman is about 30 years old, with a slight limp.
Steve Heckscher, TWA spokesman in Athens, said: "She is the prime suspect. That's the leading supposition."
He said the woman underwent a body search at the Cairo airport by an Egyptian policewoman "as part of routine security measures" and her luggage was searched by Egyptian and TWA security.
No Suspicions
The terrorist-passenger checked in late at Cairo and was driven to the Boeing 727 by a TWA official in a company car, according to Egyptian security officials. One official, speaking on condition of anonymity, said the passenger list was checked after the bombing and no suspicions were raised about any passenger.
Sally McElwreath, a TWA spokeswoman in New York, said a review found no breaches of security procedures at the Cairo, Rome and Athens airports.
She said Mansur was "subjected to the most rigorous of checks" and was driven to the plane because the shuttle bus assigned to the flight aready had left for the aircraft.
Body searches of passengers are not uncommon in Cairo, particularly of Lebanese and Palestinians.