You can add an aircraft notes to each tail and check them in a section TABLE when hovering the mouse over the aircraft registration.
Go to Settings > Fleet, choose the tail (click it) and add information you consider important (i.e. aircraft owner contact details) into the field Notes. Marking a checkbox right below makes the notes are exported on Trip Sheet document.
Once notes are inserted, in a section TABLE mark a checkbox Aircraft note in the left-hand filter, tab SHOW > Notices. Aircraft registration will get highlighted in white - hover the mouse over it to get notes displayed as a pop-up window.