When the terminal opened in 1959, the Concourses were numbered, not lettered, and progressed in the *opposite* direction as they do today.
Concourse 2 (now Concourse G): Capital, Northwest Orient, TWA, Delta
Concourse 3 (now Concourse F): National, Northeast
Concourse 4 (now Concourse E): Braniff, Pan Am, all international flights
Concourse 5 (now Concourse D): Eastern
Concourse 6 (now Concourse C): Eastern
In the early 1960s, Concourse 1 (now Concourse H) was added for Delta and United on the south side of the building.
Through the 1960s upper-level gate holdrooms and jetways were added to all the gates at MIA
- Concourse 1 opened with jetways for Delta, but the others only had ground-level gates when they were completed. Eastern's Concourse 6 (now C) was the last to be upgraded in 1967.
In the mid-1970s the concourses were assigned letter designations. The International Satellite (now part of Concourse E) was opened in 1974, connected by a Westinghouse shuttle system to the main terminal. The following year, Eastern opened a new Concourse B, although it only had a few gates. The big new Customs Hall was completed on the rear of the terminal (under the hotel and administration building) in the mid-1970s as well.
In the 1980s MIA
launched a huge upgrade program to rebuild its aging terminal. Concourse B was expanded and upgraded to include a customs hall for Eastern (Pan Am did the same with its Concourse F gates that it inherited from National). Concourse E was demolished and rebuilt in stages through the 1980s. Eastern rebuilt Concourse D between 1985 and 1988 as well.
The construction continued in the 1990s... the first phase of Concourse A opened in 1995, followed by the second phase in 1999. Concourse H was rebuilt between 1996 and 1998.
Now American is building its huge new World Gateway terminal on top of Concourses B, C and D (B and C will be demolished, D will be rebuilt yet again), and United and its Star Alliance partners are building the new Concourse J on the east side of the terminal. Concourse G - the only concourse that is still in its 1960s configuration - is slated to be rebuilt at some point in the next decade as well.