Hello,
Most of the time, even with exceptions, you need to be *very* patient when dealing with this type of case!
With rare exceptions, the proper way to proceed is by sending a registered letter with acknowledgment of receipt.
You mentioned that the originally scheduled flight departed from Basel.
More precisely, this refers to EuroAirport Basel Mulhouse Freiburg.
It’s important to note that this airport is ENTIRELY located on French territory. What’s called the "Swiss zone" at EuroAirport Basel Mulhouse Freiburg is merely the result of a Franco-Swiss police and customs agreement—nothing more.
Therefore, under the application of EU Regulation 261/2004, the French local court with jurisdiction over EuroAirport Basel Mulhouse Freiburg is the competent authority.
You didn’t specify the reason for the cancellation of the first flight segment. However, the only reason that will matter is the one the airline provides in writing.
That said, it will be more appropriate to claim compensation for the flight cancellation (the cancellation of a connecting segment counts as cancellation of the entire flight) rather than for the delay, if the re-routing offered did not meet the requirements of Article 5 of Regulation 261/2004:
Article 5
Cancellations
1. In the event of a flight cancellation, affected passengers:
(..)
c) are entitled to compensation from the operating air carrier in accordance with Article 7, unless they are informed of the cancellation:
(...)
iii) less than seven days before the scheduled departure time if they are offered re-routing allowing them to depart no more than one hour before the scheduled departure time and to reach their final destination less than two hours after the scheduled arrival time.
End of quote.
You’ll notice that in this case of cancellation and re-routing, the threshold is only 2 hours (compared to 3 hours if you file your claim under delay).
You can address your claim to the airline that was supposed to operate the first flight segment, as well as to any other airline that was supposed to operate another segment. See here:
https://retardimportantavion.wordpress.com/2024/01/12/reacheminement-catastrophique-droit-indemnisation-meme-circonstances-extraordinaires-2/You’ll find templates to follow here:
https://retardimportantavion.wordpress.comOn the other hand, if you lack patience, with rare exceptions, it’s not even worth starting.
Best regards,