Lots of them in scenarios for me. Some of the more memorable (but not all of the more memorable).
Frame 3 of the "Southern Conquest" scenario: Ride of the Valkeries!
Frame 4 of "Battle of Britain 2013". Awesome action in He 111's. Taking out targets after fighting through a hornet's nest.
Frame 4 of "Winter Sky / Death Ground". 7 kills in a frame is a lot for me (as I'm no Bruv or DrBone).
Frame 1 of "Enemy Coast Ahead". Fantastic action in 190A-5's, taking out Spitfires.
Frame 1 of "Battle Over Germany". Awesome fun scouting the bombers, and fights from high alt on down. My best frame, bagging two P-47's, two P-38's, and one B-17 in my Bf 109G-6.
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Frame 1 of "Red Storm / Krupp Steel". Awesome fights at lower alts, including some weaving through trees.
Frame 1 of "Coral Sea 2009". Marvelous torpedo-bombing action. Landing a torp hit on the Zuikaku and one on a cruiser.
Frame 4 of "Stalin's Fourth". Exhilarating ground action! I was in on one of the key captures, which we got by the skin of our teeth.
Frame 3 of "Coral Sea" in 2005. My first time torpedo bombing in a scenario. Got a torp into the Lexington, the Chicago, and one other cruiser.