Around 1-September 2019, DL swaps out a A359 aircraft doing the SEA-NRT city pairs and swaps in a A339 aircraft. From what I have analyzed so far, Delta has not redeployed this freed up aircraft into keeping it active in some way shape or form. I guess it may become a spare to be swapped in as the remaining used 12 A359 may need to be taken out of service for some "checks"....or, is this too soon for some of the oldest A359's that have now been around and in use now for 2 years? If new service is being thought of, it hasn't been disseminated yet. Any thoughts, rumors, etc?