business trip destination; place one is visiting on business
Refers to the location where one goes for a business trip, often used in contexts like reporting one's whereabouts or arranging travel.
Tomorrow's business trip destination is Osaka.
I got a call from the place I'm visiting on business.
旅行先 is a general travel destination, whereas 出張先 is specifically for business trips.
Compound of 出張 (business trip) and 先 (destination, place).