Japan Post has announced the following delays:
Canada - Due to an operator strike air mail parcels to Canada will be postponed.
Belgium - Delivery of all types of mail may be delayed to and from Belgium.
Please see the announcements on the Japan Post website here:
https://www.post.japanpost.jp/int/information/2018/1115_02_en.html
https://www.post.japanpost.jp/int/information/2018/1108_01_en.html