I am a Delta fan but have had to fly Alaska Airlines a couple of times as I traveled to the Mayo for medical care. As a passenger with a disability I appreciated the excellent care and customer service I received from the moment I checked in, until the moment I collected my luggage at my destination. 
Their staff assisted me at check in by reading forms to me because I couldn't see well enough to do it myself. The wheelchair was waiting for me and the young man who pushed it was funny and caring. The flight attendants helped me find the right seat and made me comfortable. They gave me water right away so I could take my medicine and when I fell asleep, one of them covered me with a blanket. 
The stellar customer service was much appreciated by this passenger who was quite stressed over the thought of flying alone after invasive surgery that left me temporarily almost blind.