Two airlines can sell seats on the same plane and put both companies’ flight numbers on that one trip. That arrangement is code-sharing. You might buy a ticket from Airline A, with Airline A’s number on the boarding pass, and still walk onto a plane that Airline B is actually flying.

Two airlines兩家航空公司 can可以 on the same plane賣同一架飛機上 sell seats的座位，and put並把 both companies’ flight numbers兩家公司的航班號 on that one trip都掛在那同一趟上。That arrangement那種安排 is code-sharing就是 code-sharing。You你 might可能 from Airline A向 A 航空 buy a ticket買票，on the boarding pass登機證上 with Airline A’s number印的是 A 航空的班號，and still卻仍然 walk onto走上 Airline B B 航空 is actually flying實際在飛 a plane的那架飛機

The “code” here is the short label of the flight — two letters and a number, like CI 101 — not computer code, though actually that is the mix-up almost everyone makes now, because in English class “code” so often means programming.

here這裡 The “code”的 “code” is是 the flight航班 the short label of的短代號——two letters and a number兩個字母加一個數字，like CI 101像 CI 101——not computer code不是電腦程式碼，though actually不過其實 that那 is是 almost everyone幾乎每個人 now現在 makes都會犯 the mix-up的混淆，because因為 in English class在英文課裡 “code”「code」 so often means太常指 programming寫程式

Airlines do this so they can offer more routes without buying more planes, and so a booking site can show more times of day. It is business-and-travel English: a little dry on the ticket, quite normal in airport talk.

Airlines航空公司 do this這麼做，so they can是為了能 without buying more planes不多買飛機就 offer more routes提供更多航線，and so也為了 a booking site讓訂票網站 can show能顯示 more times of day一天裡更多的時段。It它 is business-and-travel English是商務加旅遊的英文：on the ticket在機票上 a little dry有點乾硬，in airport talk在機場的對話裡 quite normal相當平常

You will also see it written codeshare or code-share. When a ticket says “operated by”, that is often this.

You你 will also也會 see it written看到它寫成 codeshare or code-share codeshare 或 code-share。When a ticket says當機票上寫著 “operated by”「由某家公司執飛」時，that那 is often常常就是 this這回事