Cops swooped on Thursday after a tip-off, it is believed.
The suspect was driven to a central London police station, where he continues to be held.
He has been questioned for six days after City of Westminster JPs granted an extension to his custody on Saturday.
Police can seek a further extension later this week if required.
His arrest followed a combined operation by the Metropolitan Police Counter Terrorism Command and the North East Counter Terrorism Unit.
The investigation is focusing on the suspect's key contacts and recent movements.
A BA spokesman said: "An employee was arrested at our Newcastle office last week.
"We take matters relating to security extremely seriously and as a responsible company always fully co-operate with the police."
It is believed there was no immediate threat of an attack on a plane or a UK target.
The employee was among 800 staff dealing with passenger bookings in one of the airline's two big British-based call centres.
Staff have access to thousands of flight details and are familiar with basic security procedures.
The UK terrorist threat level is currently at "severe", one below the top rating "critical".
The level was raised after former British University student Umar Abdulmutallab's failed bid to blow up a jet over Detroit, US, on Christmas Day.
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