Just tie the tripod legs together.
1. Remove the tripod head and handcarry.
2. Cap the screw (that attaches the tripod-head on the tripod) with a nut.
3. Remove extra/additional screws that might come off.
4. Tag a FRAGILE label (available from the airline).
When the handler see the tripod, they handle it separately instead of throwing all those normal-looking luggages. If you use a normal looking bag and tried to pack in with clothing or newspapers, they don't know and don't care. A kind airport handler told me they do that (separate handling) for items like tripods/ surfboards/ golfbags etc.. (if they can see and know)
I use the a Bogen tripod that allows me to move the lever (for locking/unlocking) towards the inside of the tripod instead of jutting out like all the tripods. Makes it easier for me to stack bags and stuff on and around the tripod.
I use that aircon tubing insulation and covered all the legs so they don't stick to my hands during winter. I leave it on permanently. This also provide some cushion.
When I need it, it flies with me. 10 years already...