I will likely be flying to Miami on the morning of Asara b’Tevet, is flying on a fast day considered to be bad luck?
All the best
Thank you for your question.
It is permitted to fly, on Asara B’tevet. This is especially if your reason for flying is for a mitzva reason, i.e. to be home for Shabbos, or for any other mitzva related reason.
Have a safe flight
The idea of not flying during the three weeks is controversial, (see Kovetz Halachos (Bein Hamitzarim) 7-3, Halichos Shlomo 14-24), if it is included in not doing dangerous things. The poskim say that if it is for a mitzva reason or even a different need that it is permitted. According to halacha, Asara B’tevet does not have the same idea (O:CH 550-2, M:B 550-6), although there are scrupulous individuals that are careful on a taanis to treat it like the nine days, it is not mandatory, especially regarding a practice that is controversial if it is even a preference. Additionally, the Mishna Berura says that even for the scrupulous individual, that whatever is needed for Shabbos is permitted.