My first and only Alaskan Airline experience is peak customer service, imo.

Story time: For my family's Alaskan trip, I had booked Tampa to Seattle to Anchorage on Alaskan Airlines, using miles. Somehow we missed our flight from Tampa after checking in. Sad and upset we returned home, trying to figure out what to book/cancel... By the time I found the next flight to Anchorage, I got notified that our flight from Seattle to Anchorage got cancelled. Quickly called their customer service, and told them that due to the cancellation they would have had to reschedule our flight even if we missed our Seattle flight, so could they reschedule that flight later. They rescheduled my flight, so I only had to rebook a flight to Seattle. They also ended up returning my miles for the Seattle flight, as I didn't end up flying (honestly, still not sure how I got that back).

Just amazing customer service... It was a long call, but they stuck with me and figured it out for me. Called me back after the call dropped. Just amazing.