The original TPA airsides were designed in the mid-1960s as four identical facilities. The concept was later scrapped for unknown reasons and the facilities were eventually built around the requirements of their then primary tenant airlines. Thus creating the four dissimilar facilities that stood from their opening in 1971 to 2000. Each airside building was three stories tall and included a minimum of ten gates, a cocktail lounge, snack bar, and gift shop. Each airside was maintained by the airline for which it was built until 1999. All of the facilities (except Airside B) were renovated in the early/mid-1990s but received no further modifications during their life span. All 4 of the original airside buildings have been demolished and either re-built or the space re-used as noted below.