Today, 06:43 AM
So, the way I see it, you have 4 different issues that require separate solutions:
1. How to get your child to take a bottle.
2. How to get her to take a bottle with formula in it.
3. What to do about the 11 hour flight.
4. What to do about the every-3-hours wake-ups.
For issue #1, I would start by pumping or expressing some breastmilk and putting that in the bottle. Formula tastes pretty nasty, and babies will often reject it because of the taste. Try offering small portions, and try different timing. Offer the bottle before nursing, when baby is hungry. Try after nursing, when she's not. Try in the middle of nursing. Try different bottles with, nipples, and milk temperatures. And most importantly, try having someone who is NOT YOU offer the bottle, maybe when you are not in the house at all. Babies rarely want bottles from their moms, because they know she has the real thing millimeters away.
For issue #2, once your baby is taking a bottle of breastmilk, start adding small amounts of formula to small breastmilk bottles (no more than 2oz). Start with a bottle that is 95% breastmilk and 5% formula, or something like that. When baby is accepting that sort of bottle, bump up the formula concentration until the baby will reliably take a bottle of plain formula.