Originally Posted by
Gajan
IMHO, that would have to be some compensation offered (though the price difference between a discounted business class and full fare Y can be quite low I would propose a fixed amount or something)
Why full Y? Perhaps at time of booking discount economy was available. If that person had
chosen to fly economy, it would probably not have been in full Y.
If you would consider this a involuntary downgrade I believe the 261/2004 rule says one should get a refund of 75% of the fare paid.