When the couple asked to be reseated, "the flight attendant denied the request."
"My ears felt like they were going to explode," a passenger said of the aircraft as it made an emergency landing.
The revelations in the purloined documents could further complicate ties between the U.S. and Germany.
A tabloid story was rejected by authorities.
A German court convicted Onesphore Rwabukombe for his role in the massacre of hundreds who were seeking refuge at a church.
Both parties voiced support for the movement, whilst organisers estimate at least 100 supporters attended.
Syriza, Greece's ruling party, is one of the groups which make up the 'Blockupy' movement.
Organisers Blockupy estimated that about 10,000 demonstrators from across Europe were at the rally.
One of Blockupy protest organisers says troika is responsible for the austerity measures that have pushed people into poverty.
Over 100,000 people have signed a petition calling for a posthumous award for Tugce Albayrak