I've done a couple things:

- traveled to my starting place with my wife who flew my case back home and then met her in my destination city with the suitcase.

- shipped my case from the starting point to the ending point. I've used friends and family as the destination. Though, I would use a hotel, if necessary.

- left my case at a hotel (near the airport) that I left from and then drove a rented car back to.

While it is a bit of a hassle, likely no more than procuring a cardboard case, cutting it to size, and then putting a bike in twice, once for each way.