Icelanta, your wise caution may not be so relevant in this discussion.
The AFM 'certificated data' (test pilot distance) is generally used with the required factoring for the pre-takeoff assessment, although some operators may use heavily factored distances for in-flight landing distance assessment.
Some manufacturers have published 'actual' data, slightly different from the AFM data (1000/1200ft air-distance, use of reverse), but this also requires careful consideration even with a minimum additional factor (15%).
Following the TALPA initiative, aircraft manufacturers agreed a more realistically achievable (actual) landing distance, commonly known as 'Operational Landing Distance' (OLD), to be published in the QRH etc.
The general basis of the changes are in
Safety First page 8. Note the reference to flare distance based on time (7sec) for OLD vs fixed distances for 'actual' data. Thus the discussion appears to relate to the latest standard of data.
Generally when OLD is published it includes a minimum factor and becomes Factored OLD (FOLD).
I believe that all Airbus and Embraer aircraft now use OLD/FOLD (including abnormal config), but for Boeing aircraft this may be limited to new types. Anyone have further info?
Also what do Boeing call this data, how is it titled; how is it differentiated from previous 'actual' data apart from reading all of the small print.
A potential hazard for operators is with operating the same 'type' of aircraft in a fleet, both legacy and new generation aircraft, or particularly for crews with a 'same type' rating (cross fleet operations) implying a mixture of 'actual' and FOLD data - the greater risk being with 'actual' data against the more conservative FOLD.