Omkalai Airport (OML) does not run anything resembling a lounge, and if you are checking before a Papua New Guinea highlands flight, that is the plain answer up front: this is a small STOL airstrip serving a remote highlands community, not a transit hub with premium space of any kind. Comfort here means the airstrip's basic shelter and a bench in the shade, not a stand-alone waiting room, so plan your expectations around that reality from the start.
Weather is the defining reality of flying in and out of Omkalai, far more than lounge access ever could be. Papua New Guinea's highlands are known for cloud, fog, and rapidly changing conditions that regularly delay or cancel flights on small STOL strips like this one, since pilots need clear visibility to land safely on short mountain runways. Build real flexibility into any highlands itinerary that includes Omkalai, since a delay here is a normal part of the route, not an exception.
For anything closer to a lounge, Mount Hagen's Kagamuga Airport is the realistic regional hub, serving the highlands with a fuller schedule of flights and better odds of airline-status facilities than a small strip like Omkalai. Port Moresby, the national capital, is the further step up, with Jacksons International Airport carrying the country's main international and domestic traffic. Neither should be expected to have Omkalai's level of remoteness reflected in the same lounge picture.
At Omkalai itself, plan for a simple wait in the airstrip's shelter, keep weather-related delays in mind when you book onward connections through Mount Hagen or Port Moresby, and confirm current flight schedules directly with your operator before you travel. Highlands aviation runs on visibility and daylight far more than a fixed timetable, so a patient, flexible approach matters more here than any lounge question ever will.