The phrase "fellow passengers" refers to the other people who are traveling with you on the same mode of transportation, such as a bus, train, or plane. These individuals are sharing the same journey or ride as you. Full definition
I saw many other guests picking up the flyers, some of them discussing the card with fellow passengers as if it was some strange new creature. (travelcodex.com)
Expect a small number of fellow passengers heading to unique destinations not on your mainstream cruise itineraries. (qantas.com)
You may need to wait for fellow passengers and guests before leaving. (havebabywilltravel.com)