I've had a suspiciously easy recovery so far. I was approved to go home the same day I had my sleeve surgery, and I only had nausea coming off anesthesia. I had no gas pain, and honestly, I'm doing really good still (10 days post-op today, I've been back at work since Monday).
All this being said, I'd prep yourself for everything just in case. I recommend extra comfy clothes, a pillow and blanket for the plane, a good neck pillow, eye mask, etc. Pack some single use alcohol wipes (my nurse opened one for me the one time I felt nauseous, and the scent chased away the nausea fast - great in moments where you can't move fast / aren't near a bathroom). Look into getting a couple LiquaCel packs. They travel good, and they tend to give these to you in the hospital, but you can order them online, too. Invest in some powder/liquid Tylenol.
And give yourself extra, extra time. You will be moving slow, and you could hurt yourself going too fast. Give yourself enough time to move as slowly as you want/as possible. ❤️ Good luck!