Hey Itchy

Never taken a bike abroad but my parents live near Granada in Spain so I will be soonish?

You defo need a bike bag for the plane journey Plus need to check howmch weight you are allowed to carry and how much baggage you can take per person i.e will the bike count as your only piece of baggage? the more expensive airlines usually have more allowance in my limited flying experience (Virgin Atlantic are pretty good to america, 23Kg per case and 2x cases per person)

Hope this helps?

When you find out please post your findings so we all know!