Cheers for the info Alan, C172 was a pure (bad) guess on my part.
Here are two more, both up in the air at the same time, over 1000ft between them....
896296 A6-MSS C172 Fujairah Aviation... 2014/11/11 15:27:11
Ok nothing wrong with that BUT...
A77426 A6MSS N58GA BE20 Papa Alpha Aviati... 2014/11/11 15:29:30
A new A6-MSS??
I'm afraid I have no records on these small things, N58GA is current on the FAA site.
Paul
ps
A6-DCD just took off using its known miscode 866390 !!