...I remember the original layout when both B and C had just ground level boarding. while A with second level boarding and an observation deck on top was still rather new.. Both B & C also had observation areas on the tarmac facing side similar to European airports along the upper part between the centre of the terminal and waiting lounge at the end.. The A concourse developed what became chronic leak issue in the roof and it wasn't uncommon to see catch buckets dotting the floor all the way to A-8 (A-8 had no jetway at the time and was usually used for Northwest L-188s).the jetways on that side of the concourse were built into the terminal and only extended enough to reach the aircrafts door. United's jetways extended further out with windows along their entire length but were permanently fixed to the ground. other than having a wheeled bogie like jetways at larger airports.

The original master plan adopted in the early 1970s was to be a symmetrical terminal with both the B and C concourses ending in rotundas and what would have be the southwest and northwest concourses (designated D and E) ending in hammerheads. A hammerhead extension would also be added at the end of the A (where Gate A-8 was) as well. The main terminal was also to be expanded to two full levels with ticketing on the upper level and baggage claim on the lower align with a multi level car park just to the west. Sadly, it never was to be. I've tried to find images of the plans and model that was built (which was displayed for a while in the terminal back then) but all I can find is information on the current master plan.

Here are some images of the original terminal

Northwest side of the A Concourse with a Stratocruiser and DC-4.


The original A concourse.


Capital AIrlines and United side of the A concourse


The 1967 renovation of the A concourse.


Observation deck along the B concourse.