 Historian Alfred Price credited McKellar with 17 air victories, three shared destroyed, five probably destroyed and three damaged. Historians Christopher Shores and Clive Williams credit him with 21 air victories, three probably destroyed and three damaged as does E.C.R Baker. In his last combat they credit him with a possible 22nd victory, since a Bf 109 crashed in the area of his last combat and no RAF pilot made a claim. John Foreman credits him with at least 17 victories and acknowledges the unclaimed Bf 109 that crashed on 1 November 1940 near to McKellar might have been his last victory. Chaz Bowyer, another prolific historian and writer on RAF personnel credits McKellar with at least 20 victories.
