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In page Cathode-ray tube:

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Some industries still use CRTs because it is too much effort, downtime, or cost to replace them, or there is no substitute available; a notable example is the airline industry. Planes such as the Boeing 747-400 and the Airbus A320 used CRT instruments in their glass cockpits instead of mechanical instruments.[17] Airlines such as Lufthansa still use CRT technology, which also uses floppy disks for navigation updates.[citation needed] They are also used in some military equipment for similar reasons. As of 2022, at least one company manufactures new CRTs for these markets.[18]