SWISS, effective the start of IATA Summer 2012 season will be adding four extra weekly roundtrip flights on the Zurich - Chicago route. The new extra flight, departing Zurich at 0955, will operate with Airbus A340-300s while the regular flight will be operated with Airbus A330-300 aircraft. From the flight number used, it appears that this flight will be for the Summer season only.
LX8 ZRH 1255 - 1540 ORD D 333
LX9 ORD 1925 - 1100+1 ZRH D 333
LX2608 ZRH 0955 - 1235 ORD 2,4,6,7 343
LX2609 ORD 1450 - 0620+1 ZRH 2,4,6,7 343