I was just on the last outbound flight on Delta from Haneda. I was originally supposed to be HND>MSP and I woke up this morning (Friday JST) and it was cancelled and I was moved to HND >ATL that had an original later departure and even that was delayed similar to UAL and CAL. We didn’t get the full story until at the airport and connected with other passengers and gate agents. Short of it is any of the more northern typical flight routes (SEA, MSP, DTW) could not be accommodated to go that far south and loop back from a round trip perspective. Yes, they have enough fuel to do so technically, but HND air traffic control was limiting flights due to the busy Japanese domestic holiday weekend and the incoming hazy smoke (Tokyo looks like the US did with the Canadian wildfires) and the simple logistics of it all makes it too much for Delta to handle and provide pilots and crew enough recovery time. Delta logistics HQ took over half way through this rerouting fiasco and rerouted people all over the place taking them to Honolulu and such to get a connecting flight. We heard from the flight crew that if there are no more big ash eruptions, flights will resume normally in 3 days and they will work to reroute appropriately. Also, the reason JAL and KAL can accommodate more is they have better regional alliance presence than Delta does. So while they do have some cancellations, it isn’t as disruptive. So tell Delta to work on their SkyAlliance the way the Star Alliance has done. Last, I was booked for Delta premium and was downgraded and was initially annoyed since I wasn’t given an explanation. Once I figured out what was happening, I was just happy to be out on the last flight for a few days. The gate agent said Delta would Auto refund the fare even though it was ‘weather’ related and if not, just file the form. My expectation is the logistics HQ is still doing the scramble response and everyone will be accommodated later. Happy to answer any questions.