No experience with Jetstar.
As I live far away from the ocean and can fish saltwater only during holidays this is a regular problem.
Also carrying around a long tube with rods doeas not make the real boss all too happy.
Solved it by buying 4 piece travel rods from cabelas, two rated at 30lb and one for 20lb. They fit into a provided rod tube ~70cm long so it fits into suitcase. No problems.
I have also read that rods checked in in long tubes where everybody can guess what it is have a habit of getting lost.