60873: Photographs of War memorial to killed and missing German airmen in Jenin, Palestine

On a recent visit to Jenin, in the Israeli-occupied Palestine West Bank, my wife, Dr. Janet Powney, chanced on a memorial to eleven German airmen [photos attached]. Translating the inscriptions on the memorial, eight were killed and three missing in the year between October 1917 and October 1918. Presumably, these casualties were the result of air battles between the German Luftstreitkräfte and the RFC (RAF from 1st April 1918) as Allenby was advancing against the Turkish army. But how did the German planes get to a battlefield so far from home? Were they flown down through the Balkans and Turkey, in a sequence of short hops? Or were they transported by rail? The latter might have been practicable: at the time, there was a continuous rail link from Constantinople (now Istanbul), with the Hejaz line running right through Palestine. Aerial conflict in the Middle East seems to be a little known aspect of the First World War.