as a recent customer, i flew to holland. i required a wheelchair assistance and let the airline know well in advance. the first conection was delayed and the person who took me down the ramp ran into two sets of ofher passengers before we boarded.
we arrived late and had to wait again. the next helper had to look around for the chair that was suppose to be ready for me.
there were many delays there and back and we had to stay in hotel, paid for by delta, that did not have wheelchairs. the room was close to the front desk, and i was able to make it, but suffered greatly.
i wrote to delta, but have never heard back
if you are in a wheelchair, delta is not the airline for you.