I, too, am having this problem with Sky & Telescope--not with issues arriving late, but with issues never arriving at all! I live in the St. Louis area and never received my Nov. and Dec. 2020 issues. I did receive the Jan. 2021 issue, but have not yet received the Feb. or Mar. 2021 issues, and I suspect that they, too, will disappear down the rabbit hole. I have called Sky & Telescope each time and asked them to extend my subscription instead of sending me another copy. I do receive all my other subscriptions, including Astronomy, so the problem does not seem to be with the USPS but with Sky & Telescope. I have noticed in the past that the Sky & Telescope issue sometimes arrives with the address label half peeled off, so I suspect that the problem is with the label glue. I mentioned this to Sky & Telescope when I called them yesterday, and they said they are aware of the problem, but the person I spoke to did not know if anything was being done about it. The label on my March issue of Astronomy is definitely harder to peel off than the ones used by Sky & Telescope. I hate to cancel my subscription, but I may have to if the problem persists.