I went according to this guide: http://data.x-plane.com/faq_designer.html#NoICAOCode . It says that if the airport has no ICAO to create a dummy, unique code for such airports by combining the ICAO country code with a two-digit number.
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Jennifer Roberts July 6, 2015 12:04 PM
X added to fictional identifier.
NickR July 6, 2015 9:24 PM
I went according to this guide: http://data.x-plane.com/faq_designer.html#NoICAOCode . It says that if the airport has no ICAO to create a dummy, unique code for such airports by combining the ICAO country code with a two-digit number.