I can't believe how difficult this is - and why rabbits are so excluded. They don't smell or make any noise. You wouldn't know what was in the carrier. Cats are allowed but are likely to be noisy and their poo is smelly (and they always pick their moment).
Have you tried any vets - I was thinking Crab Lane in particular. They may know more about bunny travel or have some pointers.
Otherwise, I suppose there are professional animal carriers. There may be some willing to talk to you or have some recommendations on their web sites.
The only person I know that transported pet rabbits was an army family and it was between Germany and the UK (both ways). I suspect they drove / used the ferry rather than plane, as all the hutches were flat-packed to go as well.
Have you tried any vets - I was thinking Crab Lane in particular. They may know more about bunny travel or have some pointers.
Otherwise, I suppose there are professional animal carriers. There may be some willing to talk to you or have some recommendations on their web sites.
The only person I know that transported pet rabbits was an army family and it was between Germany and the UK (both ways). I suspect they drove / used the ferry rather than plane, as all the hutches were flat-packed to go as well.