Seen in this postcard is the old Air Host Inn, which was located at the corner of Virginia and the airport's entrance ramp.  In the lower photo on the card, you can see the control tower in the background.

Scroll down to see a second postcard showing an aerial view of the airport.  Visible toward the lower right hand corner of the photograph is the Air Host Inn.

Here's a great postcard and one that's not all that easy to come by.  It shows the Gulf station, which was located in close proximity to the terminal at the Atlanta Airport.

As the text from the back of the card notes, it was designed to harmonize with the striking architecture of the terminal itself.

If you look closely you can see it in the postcard directly above this one.  It's on the right hand side, just a little above the halfway point.  The next page features a larger version of the card.