Considering the Lancaster was not designed as a night bomber, I'm not surprised at all it does just fine in the MA without night.
ack-ack
Well as lusche points out its a rather vulnerable bomber in the Main arena, I always wondered why they didn't just lose a few thousand pounds of ords and gave it far better defensive protection. Granted it served well as a night time bomber, I do know the British tried to R&D more defensive positions but it was given up when the war progressed.
But imagine if it flew a daylight raid against the Luftwaffe and lets say the target was schweinfurt - The P-61 might not survive as well as it did at night, but its chances are far better in Aces High with a skilled pilot then it being strictly night time.