No experience, but I've been thinking about a similar thing. I've been thinking about taking my bike next time I visit my parents. 24 hour flight (2 legs with a few hours layover), 20 kg luggage allowance. My bike kitted out the way I like it (pump, enormous saddle bag, tools, lights etc etc weighs more than 13kg. The lightest bag I've so far identified that would fit my bike is nearly 5kg. After I stowed my liquids, this means I'm lugging 2 weeks worth of clothes, shoes, presents, various gadgets etc etc on and off the air craft, and lugging it around Singapore airport at 3am, when I want to be stretching my legs and browsing electronics shops.

So, I think what I will do is take the 1 1/2 kg cloth bag I already have, a couple of luggage straps and some compression bags for my clothes, and use the clothing to protect the bike. I should be able to manage a fair amount of stuff and still come in under 20kg.

Am I mad?

ps. forgot to add helmet to my list, as they are mandatory at my destination