British Airways OSL Terminal The main international terminal of Oslo Airport (OSL), Terminal 3, is where British Airways is based. Many facilities are available at Terminal 3, such as quick check-in procedures, cozy lounges, and a wide selection of stores and eateries. Travelers using British Airways may anticipate a flawless journey with simple access to all terminal amenities. In addition, Terminal 3 has all the necessary amenities to serve travelers with special needs, making it accessible to all. From check-in to boarding, British Airways travelers can count on Terminal 3 for a seamless and pleasurable journey, regardless of when they are leaving from or arriving at Oslo Airport.