i brought both my cats down when i moved here. was only supposed to be allowed to bring one on board, but...sometimes a smile is worth a thousand...that and a LOT of tears.
anyway, technically, for both airlines it should be pretty simple and relatively the same. you will need international vet certificate, a carrier that will allow him/her to stand and turn around in (not that anyone is going to check), and thats about it.
when you book your reservation, you need to tell them that you are going to bring a pet. the airlines are only allowed to have so many pets on board per flight.
if i were you, i'd wait till i got there, plan on the cat being a carryon, and try to get them to let you put him under the seat in front of you. less stress for you, less stress for the cat. you SHOULD be allowed to do this provided you are the first to ask for it.
its a MUCH more common occurrance than you think. no one at security or anywhere else was surprised to see my babies. they WERE however surprised at the carrier i had that was on wheels so i just pulled these two cats behind me as i ran through the airport
(best deal ever...small cat carrier $8 from a catalogue i found online and they had freakin wheels! it was PURRRfect!)