LST and EDI are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. LST to EDI refers to a flight route from Launceston Airport to Edinburgh Turnhouse Airport. While you’re still figuring out your travel plans, it’s not a bad idea to learn the names and codes of other airports around these areas: Glasgow Intl Airport (GLA), Aberdeen Dyce Airport (ABZ), Inverness Airport (INV), Glasgow Prestwick Airport (PIK), Dundee Airport (DND).