Oh, there's much smaller, believe me. Have you seen some of the "Terminals" on the Pacific or Indian Ocean Islands (Maldives Atoll), Rarotonga etc. I remember seeing a wooden hut for a "terminal" in Papua New Guinea.
And if you've been to Mombasa, Moi International (Kenya), you'll recall the check-in desks are situated in the car-park outside.!!
PS. Was that in France per chance? The flag does resemble the tricolore.