Ask for a hand inspection, tell them it is professional film. Say you want the inspection even though it says "Kodak Gold 100" clearly on the cassette.
FedEx... iffy. You don't SEE them xray thepackage... but your film will
I've had no problems getting inspections in China except on domestic flights -- and even then it may have been a matter of one hurried inspector who had no patience for my rotten Mandarin. I usually carry 20-100 rolls of 35mm on int'l trips. Carry them all in a clear plastic ziploc that can be easily separated from your camera kit. Take the boxes off -- just the film cassettes and plastic cans.