All female passengers whose title was "Miss" were classified as children - not adults - on the Tui flight after a software upgrade, a report said.
That meant that their average weight used for take-off calculations was lower than it should have been.
The difference could have had an impact on take-off thrust, but the report said flight operation was not compromised.
Take-off prep documents told the pilot that his Boeing 737 jet was 1,244kg lighter than it actually was after using 35kg as the average weight of the females involved rather than 69kg.
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