PACKAGING
Most airlines simply require that luggage is removed, handlebars are turned parallel to the frame and pedals are removed to make the cycle as compact as possible. Many airlines also ask for bike tyres to be deflated.
Some airlines recommend that you use a bicycle
bag (which you can but from bike shops), but this is rarely a requirement.
Ask the airline(s) who you plan to fly with for further details.
Most of this information is provided by the CTC. To join the CTC and get insurance for you and you bike visit the link below. Bikeaccess is a great place to pick up advice about travelling with your bike.
LINKS
PREPARATION
Removing Pedals
Pedals can do a lot of damage to luggage, baggage handlers' ankles! Pedals
damage the paint-work and spokes of any other bikes they're stacked against.
Ensure that your pedals will unscrew before leaving home! A washer placed
between crank and pedal can help. Be careful when putting pedals back
into the crank arms, so as not to cross-thread them.
Protecting Gears
This delicate component is easily damaged by careless handling, or the
weight of other luggage etc. may easily bend the gear hanger too (the
part of the frame to which it is attached). An original and so far successful
piece of advice is to undo the bolt which secures the derailleur to the
frame: leaving it hanging by its cable and the chain. With mechanism and
hanger thus separated, neither are likely to be bent.
Loose Items
Remove anything that could fal off, pumps, cages
luggage lamps etc.
Wheels
Wherever possible wheels should be left in the frame rather than removed.
Keeping the wheels in place also means that baggage handlers can move
your bike around more easily.
Tyres
Som airlines insist on deflating the tyres. There is much debate as to the rlavancy of this. However, if they insist deflate them enough to satisify the airline while still protecting the rim.
Handlebars
Airlines usually require that handlebars are turned parallel to the frame.
Rubber Solution
Airlines have become more concerned over the carriage of potentially dangerous
substances - including rubber solution. We suggest that only new tubes
of rubber solution where the seal is unbroken.
Tools
Carry tools (except puncture repair kit see below), spares and heavy items
in your hand luggage on flights to avoid incurring any excess baggage
charge.