JimBobb
No, damage to ground structures from one mission is not carried forward to the next. When you shoot down an ace, they do not die. You cannot change the course of the war.
yaan98, I think both those mission types that you list are currently 'ghost' missions - they appear in the Fighter MissionTypes folder, but in all my testing and playing I have never seen either of these missions selected. The only Ground Attack missions that appear to be selected (and only for a limited set of Fighter units) are: Balloon Busting; Railyard Attack; Airfield Attack. So far as I can tell, only some French and British (and possibly USA) Fighter units are coded for Ground Attack, and not always the ones that you might expect. This might also mean that the Balloon Busting mission is not a mission currently available to German Jasta units, as I do not think that they are coded for Ground Attack and I have never seen a Balloon Busting mission selected for a Jasta pilot. In my latest MissionTypes mod (v.4) I have tried to work around this by changing the Railyard Attack to a Ground Attack mission by changing the name, briefing and the target from Railyards to Troops; and for the Germans I have tried to recreate 2-seater Schlachta attacks by re-wording, briefing, and re-targeting the Bombing Behind Enemy Front Lines mission, and by creating a ground strafing Contact Patrol type mission (Infantrieflieger) - but these really only work if the player is Flight Leader.
B.