It has been announced that Nida airport (Lithuania) officially opens again and obtains the code "A 129" (here). The source does not say that kind of code it is and what does it mean. Would it be possible to clarify? Is it a place designation, or the airport category?
Nida airport has been closed for many years. It is not very tiny, passenger planes used to land there many years ago. Recently it has been reopened for very small planes while probably something bigger would be able to land there as well. Basically this rather long runway has the status of untowered airstrip.
Nida airport has ICAO code EYND and no IATA code.