Bikes and Planes

What's involved in taking a bike on a plane? Going to Italy later in the year and would like to take my bike. It's not a riding holiday by any means, I'd just like to take a few days out cruising around.
Is it just a case of paying a small fee for an extra bag....or would it be a whole world of pain and easier to hire one whilst I'm there?
Is it just a case of paying a small fee for an extra bag....or would it be a whole world of pain and easier to hire one whilst I'm there?
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But contact the carrier for THEIR rules/requirements.
Parktools :?:SheldonBrown