QUOTE (edlee @ Oct 10 2009, 07:57 PM)

Send it UPS or FEDEX,, it will be a lot cheaper than the airlines, and they'll be a lot more careful with it. Call the hotel and tell them to expect it and hold it for you. If they don't want to,,, overnight it the day you leave. Do the same on the way back.
With the way they are all charging for a second bag,, can you imagine what they'll charge for a bike?
ed
It actually really is dependent on who you're flying with, and where you're flying to. Unfortunately, Sean has no info regarding where he's from/flying to. So, here are some varying hypothetical airlines, because I was interested as well. If you're flying an upgraded class, or you have frequent flyer status, many times they'll fly the bike for free/cheaper. Of course, it's crazy expensive to fly bikes in the USA - it's cheaper everywhere else. Note - I purposely left out RyanAir, because I unabashedly hate them.
Also, unfortunately, I don't know the dimensions or weight of his bike, so I wasn't able to compare it on UPS/FedEx.
Northwest (soon to be Delta): $100USD
American Airlines: $100 plus checked baggage fees
United: $175 (what the heck!?)
Southwest Airlines: Free as part of checked luggage, $50 if outside their specific parameters of size/weight.
British Airways: Free, within baggage limits (pay if excess baggage).
KLM/Air France: Free if Domestic (France/Netherlands), €150 everywhere else
Aer Lingus: Free if on North America/Ireland flight, €40 otherwise. They also sell bike boxes relatively cheap.
easyJet: Fees based on currency - €25 if prepaid, €35 if at airport.
Lufthansa: €70 Europe, €150 Europe/Intercontinental, €250 Intercontinental/Intercontinental via Europe. (Link is PDF)
Air Canada: $50 CAD/USD
Qantas: Ummm... you do the math.
South African Airways: Free
Korean Air: More convoluted math.
So, personally, when I flew my bikes (when it was way cheaper, and also around Europe), I generally had good luck with them - of course, I also packaged them up super well. Make sure that you get details regarding size and weight - that'll make things get a bit more expensive. The reason I mentioned sending your baggage/adaptive equipment/bike/whatever else ahead is that, depending on where you're going, you're going to have a lot on your hands - it might be a smidge easier if you explain what's up to the airline, and you can send it ahead.
But, of course, with USA-based carriers becoming more and more fixated on feeing people to death (see: United), it may be cheapest to ship items via UPS/FedEx. I've done this before (bizzarely, with motorcycle parts), and the hotel was very gracious in accepting the packages.