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Just a very quick heads-up that oneworld airlines, including British Airways, are currently offering some fantastic Business Class fares to Miami from Stockholm and Gothenburg. The lowest fare I could find was £966 return on Iberia (booked through an online travel agency), but there are plenty of options within £100 of that on BA/AA/Finnair.
Availability looks good in late December, April, and from mid June to mid September.
But, if you’re interested in collecting a boatload of high value miles from the flights, I would suggest picking one of the BA options and crediting to Alaska Mileage Plan. A return from Stockholm to Miami via Heathrow (if all legs on BA) would net you ~26,000 Alaska Miles, which I’d value at roughly £400.
If you’re more interested in Star Alliance flights, Air Canada are also offering some superb fares: