I have booking of 1 way ticket during the summer (KEF-BGO) and I'm considering buying another FI ticket and try to get the taxes and bag fee back from Norwegian booking ... or simply outright abandoning the ticket. Given FI flight will save me money on car rental during stay in Reykjavik.
If I sit back and watch the airfares (FI) will rise significantly, I barely got the W fare on another FI flight which next bucket is T (fares doubles).