[Seaplanes]

The Kampfgeschwader z.b.V. 108 was a part of the large transport force created for the invasion of Norway on 9 April 1940. The Geschwader Kommodore was Oberst Ernst-August Roth who received the title Transportchef See for the duration of the invasion. The formation of the Geschwader was ordered in March 1940, but the aircraft were not transferred to their operational bases until shortly before 9 April, due to security. On the eve of 8 April, the units were distributed as follows:
I. Gruppe/K.G.z.b.V. 108: Gruppenkommandeur Major Lessing with Staffeln 1./108 and 2./108 with He 59, and 8./108 with Ju 52 floatplanes in Norderney.
II. Gruppe/K.G.z.b.V. 108: Gruppenkommandeur Major Kaiser with Staffeln 4./108 and 7./108 both with He 59 in List.
III./K.G.z.b.V. 108: Gruppenkommandeur not known, with Staffeln 5./108 and 6./108, both with He 59.

The Staffel 9./108 was ordered formed on 11 April 1940 as a result of the developments of the fighting in the Narvik area. This Staffel was equipped with all available long range flying boats and floatplanes.

As you can see the Staffel 3./108 is missing. This is the Staffel that on 14 March 1940 was reformed as Sonderstaffel Schwilden and placed under the command of the 7. Fligerdivision for the attack on Rotterdam on 10 May. The following aircraft were destroyed or severly damaged during the Rotterdam operation: Heinkel He 59D W.Nr. 1830, 1995, 2593 and 2599. They were all written off. The remaining 8 He 59s returned after the operation, all of them with various degrees of damage from ground fire.
The Staffel Schwilden was disbanded on 12 May 1940, and the aircraft returned to Höhere Fliegerausbildungskommando 2 for distribution to training establishments.

So to the Kampfgruppe z.b.V. 108. The aircraft of this unit flew with Stammkennzeichen (four letter codes) only until the spring of 1942 when the unit was assigned the Verbandkennzeichen 7U+. In May 1943 the K.Gr.z.b.V. 108 was renumbered Transportfliegergruppe 20. This designation lasted until the end of the war and the Verbandkennzeichen 7U+ was also used to the end.

All the information in this and the other posts made are from original Luftwaffe and Kriegsmarine records available at the Bundesarchiv-Militärarchiv in Freiburg.