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42

I can't be completely sure but the most likely reason is a planned strike by ATC in south-east France. It was planned from the 30th of June to the 1st or 2nd (depending on the source) of July, meaning that ATC services would be unavailable or at least seriously reduced in that area, presumably with knock-on effects in other parts of the country. Some ...


3

Not having been there I can't tell for sure, but I would guess congestion. For safety reasons, the number of flights handled by one controller, and thus flying through their sector, in an hour is limited (to 35 IIRC). If there are more flight plans filed though it than the capacity, the flow management, handled in Europe by the Network Manager Operations ...


2

In addition to the other reasons, it might simply be a matter of avoiding ATC charges. ATC charges by the mile multiplied by a factor for the size of the plane. However out in the Bay of Biscay ATC is pretty much free. See this article on the BBC for more details. Here is a table comparing the costs.


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