seatmate

seat·mate

S0196500 (sēt′māt′)n. A person sitting next to another on a conveyance such as an airplane: "His seatmate was a gray-haired woman with glasses" (Anne Tyler).

seatmate

(ˈsiːtmeɪt) nUS the person who is sitting in the next seat

seat•mate

(ˈsitˌmeɪt)

n. a person who occupies an adjoining seat.