It's been said elsewhere on this thread/forum but it bears repeating: whatever type of case you're using, coat every inch of your bike in pipe insulation and, for awkward bits such as the rear mech, loads of bubble wrap. Pipe insulation costs and weighs next to nothing, and is reusable from trip to trip. If you wrap pretty much all your bike in it, tape or zip-tie it all in place, and then tape or zip-tie everything together so -- as scherrit says -- the bike is one item without any semi-detached bits (eg handlebars) hanging off it, your bike stands as good a chance as any of surviving even the most violent checks if airport security staff decide to take it out of its case.
Also, try to avoid keeping any hard loose parts in the bike bag (eg pedals, which Sod's law dictates will fall out of the bike bag's internal pocket and scratch something in the process); use wheel bags, even within the bike case; and don't forget spacers for the front forks and rear dropouts.
It's been said elsewhere on this thread/forum but it bears repeating: whatever type of case you're using, coat every inch of your bike in pipe insulation and, for awkward bits such as the rear mech, loads of bubble wrap. Pipe insulation costs and weighs next to nothing, and is reusable from trip to trip. If you wrap pretty much all your bike in it, tape or zip-tie it all in place, and then tape or zip-tie everything together so -- as scherrit says -- the bike is one item without any semi-detached bits (eg handlebars) hanging off it, your bike stands as good a chance as any of surviving even the most violent checks if airport security staff decide to take it out of its case.
Also, try to avoid keeping any hard loose parts in the bike bag (eg pedals, which Sod's law dictates will fall out of the bike bag's internal pocket and scratch something in the process); use wheel bags, even within the bike case; and don't forget spacers for the front forks and rear dropouts.