According to statistics of aircraft on and off strength, the Gruppe had 23 Bf 110 G-4's on 31 May and during June received 21. One was lost to enemy action and 27 were transferred to other units [The KTB records three Bf 110s lost — two of which were shot down and one abandoned — plus three damaged in accidents]. The unit ended the month with 16 Messerschmitts and also received 17 Ju 88 G-1's, one of which went for overhaul.
During the June deployment, at least three of the Gruppe's aircraft remained behind in Germany, as the Geschwaderstab KTB entry for the 4th mentions them taking part in an exercise.
The first ten Ju 88G-1s for the re-equipment of II./NJG 6 were delivered on 9 June and the Geschwaderkommodore took one of these for himself. The full complement of 30 machines was due to be delivered by the end of the month but II./NJG 6 did not receive any Ju 88s while in Italy.
This information on the Bf 110s of II./NJG 6 deployed to Italy comes from both German and Allied sources.
Bo = Bologna
Gh = Ghedi
Pe = Perugia
St = Stuttgart-Echterdingen
Most of these data derive from deciphered German signals reporting the take-off or arrival of aircraft. The two Bf 110s leaving Perugia for Ghedi on 3 June were identified from intercepted
These were transfer flights (from Ghedi to Perugia in the early evening and returning in the small hours). No detailed breakdown of patrol activity appears to have survived.