When flying from Lombok to Papua New Guinea, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Praya Lombok Intl Airport to Port Moresby Jackson Fld Airport flight would often be abbreviated as a LOP to POM flight. Lae Nadzab Airport (LAE), Mount Hagen Kagamuga Airport (HGU), Rabaul Tokua Airport (RAB), Goroka Airport (GKA), Madang Airport (MAG) are some additional IATA codes for airports related to your trip.