They flew all over but were being replaced by the jets. In '66-'67 they still flew over much of the EAL system. I had a turnaround JFK BAL BDA BAL JFK. It paid about 8 actual hours. The leg to Bermuda was about 2:30. We filled for FL 230 and it took forever to get that high. One winter night we flew VFR from DCA to LGA at 5500'. Visibility was unlimited. I think the barber pole was 320 kts and we were at it. The ground speed with a tailwind was 400 mph. The ground really rolled by fast. That was before the 250 kt limit. The Allison division of Rolls Royce is still making the engines for the C-130J but it is now a two spool engine. All the previous Electra, Orion and Hercules were of the related single spool 501 type. It was a mechanical relay airplane. You didn't write anything up until after the first landing jarred things loose. Any pilot could get in it, have somebody start it for him which was push button anyway and go out and fly it with little training required. The amount of starlings ingested in the BOS crash was hundreds and was a one in a billion event.
The Electra had 4, 60 KVA 115 VAC, 400 cycle generators. It had air-cycle HVAC machines and a freon system for extra on the ground cooling. The side panel in the walls of the cabin were electrically heated so the person sitting next to the window didn't get cold. It was probably high maintenance by today's standards. Since there are so many C-130's and P 3's still flying, engine and prop overhaul is still available. Airframe and systems parts are another story as we've seen from the beginning of this thread about the corrosion.