I did fly some years ago from Paris to Bordeaux in a Mercure and it was not a comforting experience. I do recall it was windy at the airport but I had a distinct impression the wings were flexing up and down like an overweight gull on take off and landing. A few weeks later I was scheduled to make the same journey but because of an ATC strike I was switched to an overnight rail sleeper much to my relief.
Was my experience in the Mercure unusual or was it just a windy day?