Found this on B&H Photo, of all places, and if it lives up to the press - and the price - it could be the perfect way to keep your baby safe during air travel. Certainly worth a look at $290.
Here are the specs: Made from polypropylene copolymer resin UV, solvent, corrosion, and fungus resistant (based on results from test MIL-STD-810F) Watertight gasket seal (based on results from test MIL-STD-C-4150J) Automatic ambient pressure equalization value (based on results from tests MIL-STD-648C & IP67) Resistant to corrosion and impact damage Stainless-steel molded-in hinges TSA approved trigger release locking latch system with reinforced loops for customer supplied locks Quiet-glide wheels Rubber over-molded carrying handle and pull handle Accessory compartment Full neck support