Whenever I watch the routes of aircraft flying between BIKF (Keflavik, Iceland) and e.g. EGLL (Heathrow, UK), they make a small turn in between to avoid oceanic airspace. See for example this flight route:
(Source: Screenshot of https://www.flightradar24.com/data/flights/ba894#236858ea)
The turn is made at the point where Shanwick Oceanic, Reykjavik FIR and UK airspace border each other. A direct routing would have a segment of around 220NM in Shanwick Oceanic airspace.
What's the reason, these flights don't go through Oceanic airspace? I observed that it's operator independent (ICE, BAW, EZY all fly this dented route) and it doesn't correlate with aircraft capabilities (ICE flies the same airctaft through Gander Oceanic on the way to North America all the time). So why is this routing?