A while back, I booked a one-way on SQ Y from South Asia to USA for a relative, but I know that space tends to open up closer to the day of departure. The miles I used came from a general member account (no status) and I'm wondering if award fees are additive (i.e., changing origin/destination, changing routing, changes within 21 days yields 3 different charges). I'm looking at the fee chart right now, and I'm hoping that the following possible changes cost only $75 (for either changing a connection city or changing origin), and not $150 or $225. Original itinerary: BOM-SIN-(NRT)-LAX in SQ Y Possible changes: BOM-LAX in F/J on any *A partner except SQ. PNQ-LAX in LH Y PNQ-LAX in LH J Any idea on what the change fees would possibly be? All of these possible changes would be for the same travel day (within 21 days); the only reason I'm thinking of changing is either (1) origin airport that's more convenient and/or (2) upgrade in class.