I was stationed on Oahu from 2013-2016. I cam back to WA state one time and bought a Rubicon sway bar for my Sport, wrapped it up and checked it as bag. Delta looked very confused and just asked me to unwrap it and checked to see if there was any visible leaking oil/fluid. Each website will have a policy, Delta has a specific section for checking automotive parts. It shipped for free since military are allowed a few extra bags when on leave/orders. I did all of my shopping with NR (a dirty word on WAL now) while there because they were the only company that would ship and not charge a mind boggling fee.