I have a little problem happening to my campaign. Some pilots, despite of only having one sortie (in which they died), appear to have -100 points with two KIA showing up. I looked at the DB and It only show one KIA event.
Check your Airforce_Units table, you need to have only one record for each Regiment_Code.
When you find 2 records, keep only the record which have your campaign sector name in the Campaign_Sector field.
Set some unused squadrons as campaign squadrons to allow air reinforcements as new air units for each type: fighters (PFI) bombers (PBO) etc...