Train Direction
Bound For
noun, suffix
This is a weird word. Call it exceptional. You'll see this at train stations, especially. You know the kanji means go. So, something is going somewhere. Now just use the き to help you to remember that this word means train direction (aka it tells you which direction a train is going), because this word is the key (き) to you knowing what direction you're going in so you don't get lost. You could also remember this word as "bound for" aka "Bound for Tokyo Station."
The reading is also an exception. It can be いき, but instead we're focusing on the ゆき reading. You have to remember the ゆ portion, so think of it this way:
Just think about the train direction that you (ゆ) need to go in. It's all about you. Not your friends or anyone else. You. You are the most important person at this train station.
このバスはシアトル行きです。
This bus is bound for Seattle.
行きのフライトでは少し休めましたか？
Were you able to get some rest on the departing flight?
行きは車で行って、バスでかえるつもりです。
I'm going to go by car and come home by bus.