[Jim P.]

Yes it is. In German losses a sortie was described as either a Feindflug ('F') or Heimatflug ('H'). The Heimatflug description was generally assigned to flights consisting of moving from one base to another, test flights, training flights or flights of aircraft generally not considered frontline combat types. This last is somewhat blurred based on what the end-result of the flight may have been. There are likely other types of flights as well. A Feindflug pretty much includes everything else - standing patrols and whatever. Not particularly definitive, but certainly different to the Soviet description.