I believe a lot of truth in the comments BUT there is a scarcity of hard data. The secondary histories and even the autobiographies which came out in the 50-70's did not address the data but generalities and misinformation created a fog that is only being cut through in the past 20 years due to greater access of information for a lot of reasons. One issue may be German Government reticence in allowing German wartime documents to be reprinted making research more difficult. Access is allowed but copying is restricted. A fascinating youtube account of a single German squadron (ground attack Fw-190s) taken from 1st person reports written by the actual unit is amazing illustrative over what happened to the Luftwaffe during the first days of Normandy...many of the planes were caught transferring from one field to another, in some cases carrying mechanics in the fuselages (a common German practice) and many were shot down by marauding allied fighters looking for them all over France. This kind of attrition is not covered by the continued reliance of historians covering the stats of Big Week in March which may have been only the tip of the iceberg covering allied and German sorties and small scale actions. And training aircraft were being found and shot down which must have put a severe limitation on German training. On top of that the fuel shortage was miserable, fuel could be obtained for some operations but there is no way the Germans could expend a lot of fuel for training. And of course the German bureaucracy created a shambles of EVERYTHING when under stress. The Germans were having a hard time training tank drivers for their easily broken tanks that required significant driving skill to remain unbroken.

I believe a lot of truth in the comments BUT there is a scarcity of hard data. The secondary histories and even the autobiographies which came out in the 50-70's did not address the data but generalities and misinformation created a fog that is only being cut through in the past 20 years due to greater access of information for a lot of reasons. One issue may be German Government reticence in allowing German wartime documents to be reprinted making research more difficult. Access is allowed but copying is restricted.

A fascinating YouTube account of a single German squadron (ground attack Fw-190s) taken from 1st person reports written by the actual unit is amazing illustrative over what happened to the Luftwaffe during the first days of Normandy...many of the planes were caught transferring from one field to another, in some cases carrying mechanics in the fuselages (a common German practice) and many were shot down by marauding allied fighters looking for them all over France. This kind of attrition is not covered by the continued reliance of historians covering the stats of Big Week in March which may have been only the tip of the iceberg covering allied and German sorties and small scale actions.

And training aircraft were being found and shot down which must have put a severe limitation on German training. On top of that the fuel shortage was miserable, fuel could be obtained for some operations but there is no way the Germans could expend a lot of fuel for training. And of course the German bureaucracy created a shambles of EVERYTHING when under stress. The Germans were having a hard time training tank drivers for their easily broken tanks that required significant driving skill to remain unbroken.