The phrase "a certain passenger" is correct and usable in written English.
It can be used when referring to a specific but unnamed individual among a group, often in contexts like storytelling or reporting.
Example: "During the flight, a certain passenger raised concerns about the turbulence we were experiencing."
Alternatives: "an unnamed passenger" or "a specific passenger".
He was appointed by the WTO as a panelist for DS332 Brazil Measures Affecting Imports of Retreaded Tyre in 2006, DS468 Ukraine Definitive Safeguard Measures on Certain Passenger Cars in 2014, and appointed as a member of the Permanent Group of Experts under the SCM Agreement of WTO in 2008.
Respondent brought this action to enjoin discontinuance of certain passenger trains on the ground that such discontinuance was prohibited by the Rail Passenger Service Act of 1970 (Amtrak Act).
The respondent, the National Association of Railroad Passengers (NARP), brought this action in the District Court to enjoin the announced discontinuance of certain passenger trains that had previously been operated by the Central of Georgia Railway Co. Centrall).
The White House, Office of the Press Secretary, "Proclamation Address Market Disruption From Imports of Certain Passenger Vehicle and Light Truck Tires," September 11 , 2009 whitehouse.gov; and Associated Press, "China Announces Another Massive Cut in Rare Earth Exports," December 28, 2011, www.businessinsider.com.
We compare the performance of the proposed transit system with those of comparable systems (e.g., fixed-route transit network and taxi service), and show how each system is advantageous under certain passenger demand levels.
The regional carrier, which relies on federal subsidies to provide air service connecting rural airports to nearby hubs, operates nine-passenger Cessna Caravan aircraft and needs to maintain certain passenger traffic volumes to meet federally enforced per-passenger subsidy caps.
But on a Friday in late December, the TSA revised its rules, saying an "opt out" is no longer an option for certain passengers.
Now I reckon that if an airline wants to satisfy the craving of certain passengers for a space without children, and can do so without causing problems for those travelling with their nippers, then good luck to them.
Moreover, the size of the stock may prevent certain passengers boarding a vehicle and force them to wait for a later vehicle.
"But it can detect that certain passengers are experiencing stress," and a control panel can show which passengers have left their seat belts unfastened.
