A long time ago....probably in the 1970's. The route was usually served with a DC10-30 aircraft, then switched to the 747-300. After the 743's were retired the MD11 was used, but now it seems the A330 is flying that route.
The Philadelphia route was added later. Not sure when though.
This has been a very profitable route for SR and one of its original USA routes.
I just wanted to say that Swissair does not plan to return to Philadelphia. The managment has cancelled most of the one stop flights because they werent doing too good econmically.
I have personnaly flown that route and there were maybe 20 people on board on the PHL-BOS route. In BOS the plane became really packed.
From what i know i think BOS became a Swissair destination in maybe 1948? . BOS is currently served twice daily with an A330-200 (sometimes the first flight is an MD11).