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The Bristol Crown Court jury trying science teacher Eleanor Wilson, who was accused of having sex with a student in the toilet of a plane, has been discharged after failing to reach verdicts.
The panel had been deliberating for ten and a half hours.
After the jurors were discharged, the Crown asked for seven days to consider whether to seek a retrial.
Wilson, 29, of Dursley, Gloucestershire, was accused of having drink-fuelled sexual intercourse with the teenager on a British Airways flight
home from an overseas camping trip in August 2015.
She also allegedly kissed and cuddled the boy on three other occasions.
Wilson denied four charges of sexual activity with a child by a person in a position of trust.