"First Letters then Numbers."
The letters seem to be airport codes from left to right...
orf = Norfolc International (Norfolk, VA) (USA) BEO - Belmont Airport (Newcastle, New South Wales, Australia) EWR = Newark Int. Airport, Newark, NJ (usa)
UGC - Urgench Airport - Urgench, Karakalpakstan , Uzbekistan UCA - Utica, NY [Oneida County Airport] USA UHE - Kunovice Airport - Uherske Hradiste Czech Republic
JSI - Alexandros Papadiamandis Airport Skiathos, Greece APE - San Juan Aposento Airport San Juan Aposento, Peru SLC - Salt Lake City International Airport - Salt Lake City, UT USA