The Bucharest Baneasa Airport (BBU) Terminal building (1948-152) has been recently proposed to be classified as a listed building. In order to get support, the proposal has its own webpage with some great photos of the terminal and hangars, including blueprints and photos from the thirties

http://www.inforom-cultural.ro/5+5/cladire-aeroport-aurel-vlaicu.php
(photos bottom page)

One of the oldest airports in the world (inaugurated October 1909 by Bleriot himself, on the site of a hippodrome whose owner realized the new hobby/industry could be more lucrative than horse racing)