The S stands for Sikorsky, of course, but the S-61 was a real workhorse of the industry. It began development in 1961. It pretty well takes 10 years for one of these modern heavy-lift helicopters to be developed. It had the 30-minute run-dry. For some reason, the S-92 didn't, but Sikorsky and the FAA knew that. But Sikorsky went to the FAA and said, “Look, the possibility of something going wrong and losing oil is so remote that you should certify it,” and the FAA considered it all and said, “Okay, yes we will.” Now that meant that the aircraft was certified for Canada as well as for Europe, so that an independent safety regulator wouldn't be able to change that. These are agreements that Canada is a part of with the U.S. and Europe for certifying aircraft. If the U.S. certifies aircraft, that's where most of them are manufactured, and that's it.
On December 4th, 2013. See this statement in context.