Be shure to get in touch with the airline early and don't leave that to the production company alone. Most airlines hate to see metal flightcases, so the mentioned cardboard boxes are a good idea. Bring some Gaffertape in your handluggage, just in case you have to open a box for inspection, so you can reseal it properly. I always take the lenses with me. Find out if the lenscases can be stored under your seat or, if there's no other way, on your lap.