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In the section OPS > Fleet Edit you can add notes related to the particular aircraft (i.e. aircraft owner contact details, preffered FBO, etc…) which appear in 'Legs Info' main page (top-right corner).
Now it is also possible to add these notes on te 'Trip Sheet' document.
Edit your aircraft in OPS > Fleet section, add notes in the column 'Notes' and tick the checkbox 'Add aircraft notes on tripsheet'.
When you view the 'Trip Sheet' for the flight on that particular aircraft, notes get displayed in the section 'ARCRAFT NOTES'.