Ka'b bin Malik (May Allah be pleased with him) reported: The Prophet (PBUH) set out on Thursday for the expedition of Tabuk. He liked to set out on a journey on Thursdays.
The Desirability of setting on a Journey on Thursday in the Early part of the Day
Chapter 166 · 2 hadiths
Sakhr bin Wada'ah Al-Ghamidi (May Allah be pleased with him) reported: The Messenger of Allah (PBUH) said, "O Allah! Bless my people in the early part of the day (morning). Whenever he dispatched a detachment or an army-unit, he would dispatch it at the beginning of the day (soon after dawn). The narrator, Sakhr (May Allah be pleased with him) was a merchant, and he used to send off his merchandise at the beginning of the day. So his trade flourished and he made a good fortune.
Commentary
The two Ahadith mentioned above point out the desirability to set off on a journey, business trip, Jihad or anything like that.