Rutbah Wells Imperial Airways Fort.
My Great Uncle used to fly this route for IA. The fort still exists and using Google Earth you can find it at:-
33 Degrees 3.7 Mins North
40 Degrees 23.746 Mins East
There is also a Highway Strip close by length about 12000 Ft
Great Uncles log book shows that the flights Bagdhad Alexandria in 1939 departed eary at 05:30 Loacal time (!) stopping at Rutbah Wells (also known as R3) for fuel and RAF Lydda (now Ben Gurion)
Hope this helps
Kit Yardley