These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Los Angeles Airport to Kirkwall Arpt Airport flight would often be abbreviated as a LAX to KOI flight. This flight route has multiple associated airports, so we think it might be helpful to learn the name and codes of them as well. They are Miami Airport (MIA), San Francisco Airport (SFO), Boston Logan Intl Airport (BOS), New York John F Kennedy Intl Airport (JFK), Las Vegas Harry Reid Intl Airport (LAS).