In April 2008 - a few weeks before the departure date - LO canceled my flight to Beijing and rebooked me on OS and LH. Original booking class was "W". The booking class on the new tickets turned out to be "W" as well.
In April 2009 - while waiting at the gate in MIA - the airplane went tech. I was booked on UA in booking class "W" but got new tickets on LX in booking class "Y". (which means 50% more FF miles compared to "W")
Makes me wonder how this is regulated? I always thought you would get rebooked in the same booking class or is it a matter of availability?