I'm always happy to support the publishers of guides like this but I'm wondering just how much is new in the latest 2022 21st edition (published Sep 2021). I bought the 19th edition 2020 towards the end of 2020 in anticipation of a trip either then or early last year but it never happened.

Any information on how much has changed in these strange times?

Actually, since I'm not flying until November it may as well be best to wait until September when presumably the 22nd edition will be out, but the same question will arise.