noun
luxury travel; junket
Refers to traveling in grand, often extravagant style, like a feudal lord (大名). Can be used literally or ironically for any lavish trip, especially one paid for by someone else.
社長の出張はいつも大名旅行だ。
The boss's business trips are always luxury travel.
彼は親の金で大名旅行
He's traveling in luxury on his parents' money.