"in a trip" is a perfectly acceptable sentence in written English.
You can use it whenever you are discussing a particular journey or outing. For example, "Yesterday, my family and I went on a trip to the beach."
Can't fit in a trip to Paris right now? Don't fret.
Trapped in a trip | Go Ask Alice!
At the end of November he squeezed in a trip to Israel and the Palestinian territories.
In a trip to Sacramento, Brown started Matt Barnes because Barnes grew up there.
Pass the Scarlets, and a further obstacle awaits in a trip to Exeter, a tournament novice.
Jonah's research for "Syndrome" culminated in a trip to Tunisia in January.
Two of these SID systems are described in a trip report.
Last week, frightening/agonizing pain resulted in a trip to our nearest ER.
"I'm watching the debate very carefully," Mr. Bush said in a trip to Maine.
One of them, Trevor Cahill, starts for the Athletics on Monday, another elite pitcher in a trip full of them.
Earlier on Wednesday, Mr. Gates heard largely optimistic reviews in a trip to Helmand and Kandahar Provinces in the south.
