arranged alphabetically in a counterclockwise ring. Terminal 1 (Boarding Area B), Terminal 2 (Boarding Areas C and D), and Terminal 3 (Boarding Areas E and F) handle domestic flights (including precleared flights from Canada). The International Terminal (Boarding Areas A and G) handles international flights and some domestic flights. Historically, the oldest terminal building still standing is Terminal 2, which was originally completed in 1954 as the Central Terminal with four concourses (Piers B, C, D, and E, lettered sequentially from north to south). Terminal 1 was added as the South Terminal in 1963 with Piers F/FF (Pier F had two satellite rotundas) and G, and Pier E was reassigned to the South Terminal upon its completion. International traffic was routed through Pier G, and a new Rotunda G was completed in 1974 to expand Pier G. Terminal 3 was added as the North Terminal in 1979 with Pier A. Also, once the North Terminal was completed in 1979, the piers were renamed counterclockwise, with letter designations corresponding to present-day Boarding Areas, starting with Pier A (present-day Boarding Area A, originally Pier G), Pier B (present-day Boarding Area B, originally Pier F/FF), Pier C (present-day Boarding Area C, originally Pier E), and Pier F (present-day Boarding Area F, originally Pier A). A new Pier E was added to the North Terminal in 1981 approximately where the old Pier B stood, and the Central Terminal was rebuilt with a single pier (D) to serve international flights in 1983, until a new International Terminal opened in 2000. Since then, the terminals were renamed with numbers in 2001, and the older terminals are in the process of renovation. A rebuild of Terminal 2 (formerly the Central Terminal) was completed in 2011, followed by the completion of the rebuild of Terminal 3 East (North Terminal Pier E) in 2015, and rebuilds of Terminal 1 (South Terminal) and Terminal 3 West (North Terminal Pier F) are scheduled to be complete by 2024. Airside connectors There are airside connectors at SFO that enable passengers to roam (post-security) between most adjacent terminal buildings. Connectors currently connect the A gates of International Terminal to the B gates of Terminal 1, the C gates of Terminal 1 to Terminal 2, Terminal 2 to 3, and Terminal 3 to the International Terminal G gates. There are no airside connectors between the International Terminal A and G gates (the main terminal