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You may want to look at the main EC261 thread, which is available via the forum's Dashboard, since that gives more background. Extraordinary Circumstances certainly covers weather, and BA won't take the decision to divert just on a whim. But there is also the issue as to whether BA did took all reasonable measures to minimise disruption. You can appeal BA's decision via CEDR or your small claims court, if you feel you have a strong case. The fact that other services ran may strengthen your case, but it may be due to weather and ATC restrictions en route from London specifically, plus the fact that INN is one of the most problematic airports in Europe from a pilot's perspective.