In 2001, I used award tickets to fly my wife and son to Oslo from DFW. One time I used AA to LGW and BA to Oslo, and the other time I used AA to Zurich and Swissair to Oslo. I could also have used Frankfort as the connecting point, but it is a longer flight. I preferred connecting at Zurich vs London as the airport is much easier to navigate. Any of these can be done with a single award using an AA partner for the leg to Oslo.