I formatted this into CSV today.
Columns are RADIO-TELEPHONY IDENTIFIER, OPERATING AGENCY, COUNTRY, FLIGHTPLAN DESIGNATOR . No header row.
The RADIO-TELEPHONY IDENTIFIER is what they're called by ATC e.g. ASCOT
The FLIGHTPLAN DESIGNATOR is what's in Mode-S and the flight-plan e.g. RRR
Hope it might be useful to someone.
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