I guess the first question is what is your definition of AOS?
The function of the telephone operator on toll calls is two fold: 1) to make the physical connection and 2) handle the billing.
Originally operators did it all 100% manually. Gradually automation assisted their effects. In the 1930s, the call set up work was streamlined.
After WW II the physical connection part was automated (over time). That is, the operator no longer built up a connection via various toll centers, rather, she simply dialed the area code and number. She continued to handle the billing work.
Shortly afterwards customers could dial their own station calls. Operators were needed only on coin and person/collect/card/3rd/special calls. Then customers could even dial those with the operator doing less and less. Further, the billing work itself was automated, operators no longer had to watch the time and write up toll tickets. In more recent years, machines could listen for coin drops or accept a keyed in card number. I don't know how today they handle verifying collect or person or 3rd number.
So, as you can see, the "automation" part of operator assistance has been going on since the 1930s. It's nothing new, and not attributable to a single person. The level of automation has varied from one point in time to another as well as from place to place. Indeed, some travel terminals had attended public telephone centers where an attendant in person assisted your call needs .
The owner of an hotel can and usually has added a surcharge for making any telephone call from a room. When pay phones were a dime a room call was 50c. Long distance surcharges varied. Nothing new here. The work was usually done by the hotel operator with some assist and automation from Bell.
As to airports, that's a more recent change. These days, pay phones may be privately owned and operated, and the payphone owner (through the owner of the property its located on) may charge whatever they want and handle the call any way they want. The call handling itself is an operator call as discussed above. Sometimes the traditional telephone company handles it, sometimes a specialty firm handles it.
I hope I didn't confuse the issue, but I think more definition of what you're looking for in terms of historical context is necessary.
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