I'm not in a wheelchair, "yet", but it looks like it is definitely in my future. To this point, I have used wheelchair assistance at each of the airports in my travel. I travel back and forth between MS in the US, and the Philippines.
Others I have travelled with have seemingly had no problems. It does make it a lot easier if you are either travelling with someone, or have someone to meet you at your destination.
Good luck with your travel. I love living in the Philippines, yet it's nice to go back each year and visit with my grown children in the US. It's not likely mine will come visit; not for lack of desire, but lack of budget. I can Really relate to that aspect.