I am flying from DTW to MCO on Delta. I purchased a first class ticket. I have difficulty walking due to a bad accident That I was involved in last year. I also require a special seat cushion due to pelvic pain. I have requested assistance getting to the gate at the time that I purchased my ticket. My questions are, how early should I arrive before my flight? Does the request for assistance to and from the gates usually work well? And will they allow me to take a special seat pad onto the plane to make my seating more comfortable? Thank you in advance.