Ok, I have booking from WNZ (MU) to HKG (CX) and HKG (CX) to JFK (CX) on the same date. I decided rather than rush home to USA I will stay overnight in HKG to enjoy the city for one night. So I called MPC to ask for the change. The lady helping me put me on hold for literally 10 minutes (no doubt she's a rookie and asking her more experienced collegue for help on this simple request), and then she returned and says: "we can change it for you but you need to pay $150 USD 'transit fee'..." I was like WHAT? I've never heard of this "transit fee" before, so I asked her to explain that one to me.

She says a transit fee is when you delay in your transit with CX airlines. The ticket is MU --> CX on the same date, and because I wanted to delay a day that CX will charge me $150 USD. I was like er.... NO.

Called my travel agent back in the States instead, get him to change my date, done. Call back MPC to make sure it's done, and yes it's done (with the agent obviously annoyed that I would call just to confirm a confirmed ticket)

Anyway, what the hell is 'transit fee'?