noun
Refers to a business that arranges travel, sells tickets, and provides related services. The term is straightforward and commonly used.
旅行代理店で航空券を予約した。
I booked a flight ticket at a travel agency.
旅行会社 is a more general term for a travel company, while 旅行代理店 specifically emphasizes the agency/agent aspect, often implying a retail outlet that sells travel products on behalf of suppliers.
Compound of 旅行 (travel) + 代理店 (agency). The word is transparent and modern, with no obscure historical derivation.