Morning/evening (not Every Day) Transportation

My child's mother and I are not together. We have a schedule for sharing time with our son. She has recently lost her ability to drive. I am looking for transportation for my son to and from school on the days she has him in her care. The relationship between her and me is good; there is no odd or hostile environment (lol), but we simply need help with his transportation on the days she has him. The schedule rotates through the week and per week. For example, one week he would need transportation Monday+Tuesday AM and PM, and Friday evening only. The following week would be flipped. Monday AM only, Wednesday+Thursdsay AM and PM. The schedule may seem odd at first but its predictable once you do it a time or two. I would be communicating with you at least a week in advance to set the schedule.