Codeshare meaning

(aviation) Agreement whereby an airline buys space on another airline and markets the extra space as its own. Often used to increase a route network without the costs of running a full service.
noun
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(aviation, intransitive) To buy space on (a flight) in this way.
verb
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Origin of codeshare

  • code +‎ share, because of the change in the flight's two-letter airline identity code. One aircraft will have two or more codes and flight numbers.

    From Wiktionary