checking in your tripod is usually bad idea.. especially for certain airports, where they handle your luggage like handling pieces of invulnerable material.. someone here had their tripod broken before wehen they checked it in, best not to take the risk. :nono:
I'd always check in my Manfrotto 055CL during my travels over past 4 years- India, Mongolia, Beijing, London, Edinburgh all without problems. Reason is my tripod is very tall and heavy, so it will be very clumsy to carry as cabin luggage. I only carry the bare essentials on my cabin luggage and of course the camera and lenses. The latter 2 items are already bulky enough. No need to add another tripod on top of them all.
I put my tripod in my backpack cos I go backpacking and never carried those nice protective hard casing hand luggage. Nevertheless, the tripod survived them all and I'm still happily using my tripod. Nevertheless, I remove my tripod head from the body and pack the head with with my clothings. Manfrotto tripods are very sturdy and are meant to survive the outdoors, so it ain't a problem.
Saw a fellow passenger travel with a bare tripod (about 1 foot in length) attached to the side of his bag. This was on a SQ flight to Manila. I suppose it depends on the size of your tripod. If it is deemed huge and heavy and can be used as a weapon, then they may be sticky about it. No harm in putting it in a tripod bag and carry on-board, after all , the bag is almost weightless.
Have hand carried to and from Australia, no problems at all. Do consider checking in the tools like ring spanner and foot spikes though, while I had no problems bringing from Singapore to Australia, when coming back their customs made me dump them - and TBH they were pretty unreasonable and rude about it so I've no idea if it's standard procedure.
I always ensured there was enough space to squeeze my tripod into my checked-in luggage while I was backpacking around Europe 1 year ago. (Dun wanna take the chance to go through the security questioning and stuff like that.) Luckily my tripod survived all those luggage handling
Of cos, that also depends on the size of your tripod...