Originally Posted by Some person

That's why I wrote that "It is unclear what "under comparable transport conditions" means." It may well be that the conditions are not comparable if the carrier is not the same as the one originally booked.

If the carrier doesn't fulfill its rebooking obligations, the passenger would normally be entitled to compensations. Ideally, the obligations should be tested in court so that people will know what rights they have. However, it could be expensive for the passenger to test this if the passenger is wrong, so it's better if it is tested by "someone else" who would then be the one who risks having to pay a large amount of money.