"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