There may be but a handful of vintage airport terminals left in the United States, and the very fact that some exist at all depends on some specific circumstances. Typically they are found at airports that for whatever reason could not, or did not, expand at a rate to justify destroying their original terminal and replacing it with a larger, more functional structure.
USAAF Central Technical Training Command
Hawthorne Global Aviation Services in New Orleans completed an extensive restoration of its terminal after Lakefront Airport suffered flooding from Hurricane Isaac in September. The $3.5 million facility opened as an FBO in February and Hawthorne acquired it only a month before the storm. Like other service providers on the field, the Hawthorne FBO was forced to relocate to a trailer while the ground floor of the building was gutted and rebuilt.