I've read that it might be wiser to describe it as "sports equipment" and leave it at that, if you can. But I've not tried this myself.

Some threads over at bikeforums, but outside of that I can't offer specific advice/suggestions. Can you "de-register" and check their T&Cs for specific guidance?

Anyone fly international with maximum sized luggage?

Getting your bike and box to the airport, a personal account

Airlines are making bicycle transport more difficult.

I've never used this bikeflights service, but it may be worth considering. Not cheap, however.