MD PA stands for Medical Doctor, Professional Association. The Professional Association designation is a legal term used to describe a separate legal entity, much like an incorporated business.
Uber launches Scheduled Rides, so you can (finally) book a car in advance. users will be able to schedule a pickup anywhere from 30 minutes to 30 days in advance.
I booked mine 11 months ahead, so I'd say you can at least book a year ahead. I would say you can book reservations about a year ahead. We have booked ours 6 months ahead and we were okay with that too. is a helpful site when it comes to planning your Walt Disney World vacation.