In present, almost all of bigger cities in the continent own airport. The same is in USA, Canada or Australia. Buying flight tickets is a lot more common for everyone, then it was 15 years earlier. But there are couple big airfields in the world, extents of it are sometimes larger then size of a small town. Airports like that are capable to send people to antipodes with one tour! They are so big, that sometimes you may need a map to avoid getting lost.
Often to the place where you want to travel you cannot go directly or flight itself is not very nice when we talk about money. Regularly strictly to a given direction just fly non-commercial flights and it costs is very high. So where to go?