I was worried when ordering since some reviews say it's too short for Epiphone Vintage PRO basses, but it fits perfectly and has a good inch of space between the headstock and the inner wall of the case. Quality seems good, but I guess I wont know until it has been thrown in and out of cars/vans/buses for a while. It might be a bit of a gamble to fly with it, but I would probably test it out if I put on additional locking straps designed for flight bagage.
Overall a good and solid case that offers a snug fit for your Thunderbird. Keep in mind that it's a bit heavy though, I wouldn't want to carry it around for too long.