机票
jī piào · HSK 1
plane ticket
✈️🎫 机票 = 机 (machine, as in 飞机 airplane) + 票 (ticket)
机 is the same 机 from 飞机 (airplane), short for 飞行机器 'flying machine'. 票 is a generic ticket morpheme — also in 车票 (train ticket) and 门票 (entry ticket). So 机票 literally reads as 'plane ticket'.
票 — fire 火 (bottom) + 覀 (cover/west)
Originally written with 火 (fire) below 覀, depicting sparks or embers rising from a fire. The early meaning was 'flying sparks' or 'light, floating thing.' Over time it shifted to mean a slip of paper, ticket, or note — something light and easily passed around.