Masalembo Airport does not have a lounge, and the reason comes down to the kind of flying that actually happens here. This small strip serves the remote Masalembu Islands in the middle of the Java Sea, reachable mainly through Indonesia's perintis, or pioneer, subsidized flight network rather than a mainline airline schedule, and that kind of service was never going to support a card-network or airline-club lounge.
Perintis routes typically fly small turboprop aircraft on subsidized government contracts to connect isolated island communities that would otherwise depend entirely on sea transport, and Masalembo fits that pattern closely. Flights are infrequent, aircraft are small, and the terminal building, where one exists at all, is built for basic processing of a handful of passengers rather than a business-class experience. Sea transport remains the fallback for these islands whenever weather grounds the small aircraft, underscoring how thin the connection to the outside world already is before a lounge conversation could even begin.
Surabaya, served by Juanda International Airport on the East Java mainland, is the real regional hub for this part of Indonesia, and it is where the lounge conversation genuinely applies: Garuda Indonesia and other carriers operate premium spaces there for business travelers and elite members, a world away from a pioneer-route island strip like Masalembo. Travelers who do reach Masalembo typically do so for research, government service, or a genuine off-the-beaten-path visit rather than a connecting itinerary.
If your journey includes Masalembo, plan for a modest, functional airstrip experience tied to the perintis schedule rather than anything resembling a lounge, and build flexibility into your trip since subsidized rural routes can shift with government contracts and seasonal weather in the Java Sea. Arrangements change - verify current flight schedules directly with the operator before you travel, since remote island service like this is run on a different rhythm than mainland Indonesian aviation.